Astronomy:Planet Hunters

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Short description: Citizen science project to find exoplanets
Planet Hunters
Planethunters.jpg
Type of site
Volunteer Scientific Project
Available inEnglish
OwnerPlanet Hunters Team
Created byPlanet Hunters Team
Websitewww.planethunters.org
CommercialNo
RegistrationOptional
Launched16 December 2010;
13 years ago (2010-12-16)
Current statusOngoing

Planet Hunters is a citizen science project to find exoplanets using human eyes. It does this by having users analyze data from the NASA Kepler space telescope and the NASA Transiting Exoplanet Survey Satellite.[1][2] It was launched by a team led by Debra Fischer at Yale University,[3] as part of the Zooniverse project.[4]

History

Planet Hunters and Planet Hunters 2.0

The project was launched on December 16, 2010, after the first Data Release of Kepler data as the Planet Hunters Project.[5] 300,000 volunteers participated in the project and the project team published 8 scientific papers. On December 14, 2014, the project was re-launched as Planet Hunters 2.0, with an improved website and considering that the volunteers will look at K2 data.[6] As of November 2018 Planet Hunters had identified 50% of the known planets with an orbital period larger than two years.[7]

Non-Planet Hunters project: Exoplanet Explorers

In 2017 the project Exoplanet Explorers was launched. It was another planet hunting project at Zooniverse and discovered the system K2-138 and the exoplanet K2-288Bb. This project was launched during the television program Stargazing Live and the discovery of the K2-138 system was announced during the program.[8]

Planet Hunters TESS (PHT)

On December 6, 2018, the project Planet Hunters TESS (PHT) was launched and is led by astronomer Nora Eisner. This project uses data from the Transiting Exoplanet Survey Satellite (TESS) and is currently active (as of March 2023).[2] This project discovered the Saturn-sized exoplanet TOI-813 b[9][10] and many more.

Until March 2023 PHT discovered 284 exoplanet candidates (e.g. TIC 35021200.01[11]), 15 confirmed exoplanets (e.g. TOI-5174 b[12][13]) and countless eclipsing binaries. All discovered exoplanet candidates are uploaded to ExoFOP by Nora Eisner or sometimes by another project member (see TOI and CTOI list provided by ExoFOP[14]).

All exoplanet candidates are manually checked by multiple project members (volunteers and moderators) and need to pass different tests before they are accepted by Nora Eisner and uploaded to ExoFOP. But it is possible that not all PHT planet candidates become real (confirmed) exoplanets. Some of them may be grazing eclipsing binaries.

Planet Hunters: NGTS

On October 19, 2021, the project Planet Hunters: NGTS was launched. It uses a dataset from the Next Generation Transit Survey to find transiting planets. It is the first Planet Hunters project that uses data from a ground-based telescope. The project looks at candidates that were already automatically filtered, similar to the Exoplanet Explorers project.[15] The project found four candidate planets so far.[16]

Planet hunting

The Planet Hunters project exploits the fact that humans are better at recognising visual patterns than computers. The website displays an image of data collected by the NASA Kepler Space Mission and asks human users (referred to as "Citizen Scientists") to look at the data and see how the brightness of a star changes over time. This brightness data is represented as a graph and referred to as a star's light curve. Such curves are helpful in discovering extrasolar planets due to the brightness of a star decreasing when a planet passes in front of it, as seen from Earth.[17] Periods of reduced brightness can thus provide evidence of planetary transits, but may also be caused by errors in recording, projection, or other phenomena.[18]

Special occurrence

Eclipsing binary stars

From time to time, the project will observe eclipsing binary stars. Essentially these are stars that orbit each other. Much as a planet can interrupt the brightness of a star, another star can too. There is a noticeable difference on the light curves. It will appear as a large transit (a large dip) and a smaller transit (a smaller dip).[19][20]

Multiplanet systems

As of December 2017, there are a total of 621 multiplanet systems, or stars that contains at least two confirmed planets.[21] In a multiplanet system plot, there are many different patterns of transit. Due to the different sizes of planets, the transits dip down to different points.[22]

Stellar flares

Stellar flares are observed when there is an explosion on the surface of a star. This will cause the star's brightness to shoot up considerably, with a steep drop off.[23]

Discoveries

Artist's impression of TOI-813 b, an exoplanet discovered by Planet Hunters

So far, over 12 million observations have been analyzed. Out of those, 34 candidate planets had been found as of July 2012.[24] In October 2012 it was announced that two volunteers from the Planet Hunters initiative had discovered a novel Neptune-like planet which is part of a four star double binary system, orbiting one of the pairs of stars while the other pair of stars orbits at a distance of around 1000 AU. This is the first planet discovered to have a stable orbit in such a complex stellar environment. The system is located 7200 light years away,[25] and the new planet has been designated PH1b, short for Planet Hunters 1 b.[26][27]

Key
# circumbinary planet
§ Planet orbiting around one star in a multiple star system (S-class or Satellite-class planet)
multiple planets Host star with a Planetary system (two or more planets)

Yellow indicates a circumbinary planet. Light green indicates planet orbiting around one star in a multiple star system. Light blue indicates host stars with a planetary system consisting of two or more planets. Values for the host stars are acquired via SIMBAD[28] and otherwise are cited. The apparent magnitude represents the V magnitude.

Planet Mass
([[Astronomy:Jupiter mass		 J}}}}}}]]) Radius
([[Astronomy:Jupiter radius		 J}}}}}}]]) Orbital
period
(d) 		Semimajor
axis
(AU) 		Orbital
ecc. 		Inclin.
(°) 		Star Constell.
 App.
mag. 		Distance
(ly) 		Spectral
type 		Year of confirmation Ref
PH1b#
(Kepler-64b)		 <0.531 0.55 138.3 0.65 0.07 90.1 Kepler-64 Cygnus 13.718 7200 F/M 2012 [27][29]
PH2b
(Kepler-86b)		 <80.0 0.9 282.5255 0.828 0.12 - 0.49 89.8 Kepler-86 Cygnus 12.699 1200 ~G4 2013 [30][31][32]
PH3b
(Kepler-289b) 		0.002 - 0.04 0.19 34.545 0.2 89.6 Kepler-289multiple planets Cygnus 14.144 2300 2014 [33][34][31]
PH3c
(Kepler-289c)		 0.4 1.03 125.85 0.5 89.8 [33][35]
PH3d
(Kepler-289d) 		0.01 0.24 66.1 0.3 89.7 [33][36]
WASP-47d 0.04 0.32 9.031 0.07 - 0.1 <0.014 89.3 WASP-47multiple planets Aquarius 11.9 870 G9V 2015 [37][38][39]
WASP-47e 0.02 0.16 0.7896 0.02 0.01 - 0.07 86.0 [37][38][40]
Kepler-455b 0.6 1311.1 - 1708.4 90.0 Kepler-455 Cygnus 14.355 4100 2015 [41][42][31]
Kepler-456b 0.2 - 2.9 1167.6 - 13,721.9 89.8 Kepler-456 Lyra 12.819 2500 F5V 2015 [43][42][31]
Kepler-457b 0.2 - 0.6 31.81 89.3 Kepler-457multiple planets Lyra 14.331 3600 2015 [44][42][31]
Kepler-457c 0.1 - 0.4 74.1 - 114.1 89.7 [45][42]
Kepler-458b 0.4 572.38 89.8 Kepler-458multiple planets Cygnus 14.083 5500 F6IV 2015 [46][42][31]
Kepler-459b 0.5 854.08 89.9 Kepler-459 Lyra 15.487 5000 2015 [47][42][31]
Kepler-460b§ 0.6 440.78 89.9 Kepler-460multiple planets Lyra 13.827 4300 F6IV 2015 [48][42][25][31]
TOI-813 b 0.60 83.89 0.42 89.6 TOI-813 Dorado 10.286 870 G0 IV 2020 [49][9]
TOI-1338 b# 0.104 0.611 95.174 0.4607 0.0880 89.37 TOI-1338 Pictor 11.722 1300 M+G 2020(?) [50][51][52][53]
HD 152843 b 0.017-0.057 0.304 11.6264 0.1053 0.14 88.85 HD 152843multiple planets Hercules 8.85 351.9 G0 2021 [54]
HD 152843 c <0.086 0.520 19.26-35 0.115 88.89 [54]
TOI-5174 b 0.48 (5.351 Earth radii) 12.214286 TOI-5174 Leo 11.583 643.33 G6.0V (derived) 2022 [55][56][57]

Community TESS Object of Interest

Planet Hunters TESS (PHT) publishes Community TESS Object of Interest (CTOI) at ExoFOP, which can be promoted into a TESS Object of Interest (TOI). Of the 151 CTOIs submitted by Planet Hunters researchers, 81 were promoted to TOIs (as of September 2022).[58] The following exoplanets first submitted as PHT CTOIs were later researched by other teams (some examples): TOI-1759 b,[59][60][61] TOI-1899 b,[62] TOI-2180 b[63] and TOI-4562 b.[64][65]

Variable stars and unusual systems

In September 2013 the project discovered the unusual cataclysmic variable KIC 9406652.[66] In April 2014 the unusually active SU Ursae Majoris-type dwarf nova GALEX J194419.33+491257.0 was discovered. This cataclysmic variable was discovered as a background dwarf nova of KIC 11412044.[67]

In January 2016 unusual dips in KIC 8462852 were announced. The unusual light curve of KIC 8462852 (also known as Boyajian's Star)[68] has engendered speculation that an alien civilization's Dyson sphere[69][70] is responsible.[71]

In June 2016 the project found 32 likely eclipsing binaries. The work also announced likely exoplanets.[72]

In February 2018 the first transiting exocomets were discovered. The dips were found by one of the authors, a Planet Hunters participant, in a visual search over five months of the complete Q1-Q17 Kepler light curve archive spanning 201250 target stars.[73][74]

In February 2022 Planet Hunters:TESS announced the discovery of BD+61 2536 (TIC 470710327), a massive hierarchical triple star system. The system is predicted to undergo multiple phases of mass transfer in the future, and likely end up as a double neutron star gravitational wave progenitor or an exotic Thorne-Zytkow object.[75]

See also

Zooniverse projects:


References

  1. ↑ "What is Planet Hunters". Planet Hunters website. https://www.planethunters.org/#/about. 
  2. ↑ 2.0 2.1 Zooniverse, The (2018-12-06). "Planet Hunters TESS" (in en). https://blog.planethunters.org/2018/12/06/planet-hunters-tess/. 
  3. ↑ "Citizen Scientists Join Search for Earth-like Planets". 16 December 2010. http://news.yale.edu/2010/12/16/citizen-scientists-join-search-earth-planets. 
  4. ↑ "The Zooniverse". Zooniverse website. https://www.zooniverse.org/. 
  5. ↑ Meg (2010-12-16). "Planet Hunters Introduction" (in en). https://blog.planethunters.org/2010/12/16/planet-hunters-introduction/. 
  6. ↑ Meg (2014-09-18). "A Brand New Planet Hunters" (in en). https://blog.planethunters.org/2014/09/18/a-brand-new-planet-hunters/. 
  7. ↑ debrafischer (2018-11-26). "Planet Hunters: a new beginning!" (in en). https://blog.planethunters.org/2018/11/26/planet-hunters-a-new-beginning/. 
  8. ↑ Miller, Daniel (2017-04-06). "Stargazing Live viewers find four-planet solar system" (in en-AU). https://www.abc.net.au/news/2017-04-06/stargazing-live-four-planets-discovered-in-new-solar-system/8423142. 
  9. ↑ 9.0 9.1 Eisner, N. L.; Barragán, O.; Aigrain, S.; Lintott, C.; Miller, G.; Zicher, N.; Boyajian, T. S.; Briceño, C. et al. (January 2020). "Planet Hunters TESS I: TOI 813, a subgiant hosting a transiting Saturn-sized planet on an 84-day orbit" (in en). Monthly Notices of the Royal Astronomical Society 494 (1): 148. doi:10.1093/mnras/staa138. ISSN 0035-8711. Bibcode: 2020MNRAS.494..750E. 
  10. ↑ "The Extrasolar Planet Encyclopaedia — TOI-813 b". Extrasolar Planets Encyclopaedia. https://exoplanet.eu/catalog/toi_813_b--7187/. 
  11. ↑ "PHT candidate TIC 35021200.01" (in en). 2023-03-11. https://exofop.ipac.caltech.edu/tess/target.php?id=35021200. 
  12. ↑ "confirmed TOI-5174 b" (in en). 2023-03-11. https://exoplanetarchive.ipac.caltech.edu/overview/TOI-5174. 
  13. ↑ "confirmed TOI-5174 b" (in en). 2023-03-11. https://exofop.ipac.caltech.edu/tess/target.php?id=49428710. 
  14. ↑ "ExoFOP overview" (in en). 2023-03-11. https://exofop.ipac.caltech.edu/tess/. 
  15. ↑ chrislintott (2021-10-19). "Welcome to a new Planet Hunters!" (in en). https://blog.planethunters.org/2021/10/19/welcome-to-a-new-planet-hunters/. 
  16. ↑ astrosobrien (2022-09-09). "Planet Hunters NGTS: More detail on our first four Planet Candidates" (in en). https://blog.planethunters.org/2022/09/09/planet-hunters-ngts-more-detail-on-our-first-four-planet-candidates/. 
  17. ↑ Administrator, NASA Content (2015-04-16). "Light Curve of a Planet Transiting Its Star" (in en). NASA. https://www.nasa.gov/mission_pages/kepler/multimedia/images/transit-light-curve.html. 
  18. ↑ "Planet Hunting Tutorial". Planet Hunters website. http://www.planethunters.org/site_guide#video. 
  19. ↑ "Eclipsing Binary Stars". Planet Hunters website. http://www.planethunters.org/site_guide#video. 
  20. ↑ "Eclipsing Binary Light Curves". https://imagine.gsfc.nasa.gov/educators/hera_college/binary-model.html. 
  21. ↑ Schneider, Jean (16 December 2017). "Interactive Extra-solar Planets Catalog". Extrasolar Planets Encyclopaedia. https://exoplanet.eu/catalog/. 
  22. ↑ "Multiplanet Systems". Planet Hunters website. http://www.planethunters.org/site_guide#video. 
  23. ↑ "Stellar Flares". Planet Hunters website. http://www.planethunters.org/site_guide#video. 
  24. ↑ "Planetometer". Planet Hunters website. http://www.planethunters.org/planetometer. 
  25. ↑ 25.0 25.1 Gaia Collaboration (2018-08-01). "Gaia Data Release 2 - Summary of the contents and survey properties" (in en). Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. ISSN 0004-6361. Bibcode: 2018A&A...616A...1G. 
  26. ↑ "Planet with four suns discovered by volunteers". BBC News. 15 October 2012. https://www.bbc.co.uk/news/science-environment-19950923. 
  27. ↑ 27.0 27.1 Schwamb, Megan E.; Orosz, Jerome A.; Carter, Joshua A.; Welsh, William F.; Fischer, Debra A.; Torres, Guillermo; Howard, Andrew W.; Crepp, Justin R. et al. (2012). "Planet Hunters: A Transiting Circumbinary Planet in a Quadruple Star System". The Astrophysical Journal 1210 (2): 3612. doi:10.1088/0004-637X/768/2/127. Bibcode: 2013ApJ...768..127S. 
  28. ↑ "SIMBAD Astronomical Database - CDS (Strasbourg)". http://simbad.u-strasbg.fr/simbad/. 
  29. ↑ "PH1b". https://exoplanetarchive.ipac.caltech.edu/cgi-bin/DisplayOverview/nph-DisplayOverview?objname=PH1b&type=CONFIRMED_PLANET. 
  30. ↑ Wang, Ji; Fischer, Debra A.; Barclay, Thomas; Boyajian, Tabetha S.; Crepp, Justin R.; Schwamb, Megan E.; Lintott, Chris; Jek, Kian J. et al. (October 2013). "Planet Hunters. V. A Confirmed Jupiter-size Planet in the Habitable Zone and 42 Planet Candidates from the Kepler Archive Data" (in en). Astrophysical Journal 776 (1): 10. doi:10.1088/0004-637X/776/1/10. ISSN 0004-637X. Bibcode: 2013ApJ...776...10W. 
  31. ↑ 31.0 31.1 31.2 31.3 31.4 31.5 31.6 31.7 Zacharias, N.; Finch, C.; Subasavage, J.; Bredthauer, G.; Crockett, C.; Divittorio, M.; Ferguson, E.; Harris, F. et al. (October 2015). "The First U.S. Naval Observatory Robotic Astrometric Telescope Catalog" (in en). The Astronomical Journal 150 (4): 101. doi:10.1088/0004-6256/150/4/101. ISSN 0004-6256. Bibcode: 2015AJ....150..101Z. 
  32. ↑ "PH2b". https://exoplanetarchive.ipac.caltech.edu/cgi-bin/DisplayOverview/nph-DisplayOverview?objname=PH2b&type=CONFIRMED_PLANET. 
  33. ↑ 33.0 33.1 33.2 Schmitt, Joseph R.; Agol, Eric; Deck, Katherine M.; Rogers, Leslie A.; Gazak, J. Zachary; Fischer, Debra A.; Wang, Ji; Holman, Matthew J. et al. (November 2014). "Planet Hunters. VII. Discovery of a New Low-mass, Low-density Planet (PH3 C) Orbiting Kepler-289 with Mass Measurements of Two Additional Planets (PH3 B and D)" (in en). Astrophysical Journal 795 (2): 167. doi:10.1088/0004-637X/795/2/167. ISSN 0004-637X. Bibcode: 2014ApJ...795..167S. 
  34. ↑ "Kepler-289 b". https://exoplanetarchive.ipac.caltech.edu/cgi-bin/DisplayOverview/nph-DisplayOverview?objname=Kepler-289+b. 
  35. ↑ "Kepler-289 c". https://exoplanetarchive.ipac.caltech.edu/cgi-bin/DisplayOverview/nph-DisplayOverview?objname=Kepler-289+c. 
  36. ↑ "Kepler-289 d". https://exoplanetarchive.ipac.caltech.edu/cgi-bin/DisplayOverview/nph-DisplayOverview?objname=Kepler-289+d. 
  37. ↑ 37.0 37.1 Zooniverse, The (2015-11-04). "Hot Friends of Hot Jupiters: The WASP-47 system" (in en). https://blog.planethunters.org/2015/11/04/hot-friends-of-hot-jupiters-the-wasp-47-system/. 
  38. ↑ 38.0 38.1 Becker, Juliette C.; Vanderburg, Andrew; Adams, Fred C.; Rappaport, Saul A.; Schwengeler, Hans Martin (October 2015). "WASP-47: A Hot Jupiter System with Two Additional Planets Discovered by K2" (in en). Astrophysical Journal Letters 812 (2): L18. doi:10.1088/2041-8205/812/2/L18. ISSN 0004-637X. Bibcode: 2015ApJ...812L..18B. 
  39. ↑ "WASP-47 d". https://exoplanetarchive.ipac.caltech.edu/cgi-bin/DisplayOverview/nph-DisplayOverview?objname=WASP-47+d. 
  40. ↑ "WASP-47 e". https://exoplanetarchive.ipac.caltech.edu/cgi-bin/DisplayOverview/nph-DisplayOverview?objname=WASP-47+e. 
  41. ↑ "KIC 3558849 b". https://exoplanetarchive.ipac.caltech.edu/cgi-bin/DisplayOverview/nph-DisplayOverview?objname=KIC+3558849+b. 
  42. ↑ 42.0 42.1 42.2 42.3 42.4 42.5 42.6 Wang, Ji; Fischer, Debra A.; Barclay, Thomas; Picard, Alyssa; Ma, Bo; Bowler, Brendan P.; Schmitt, Joseph R.; Boyajian, Tabetha S. et al. (December 2015). "Planet Hunters. VIII. Characterization of 41 Long-period Exoplanet Candidates from Kepler Archival Data" (in en). Astrophysical Journal 815 (2): 127. doi:10.1088/0004-637X/815/2/127. ISSN 0004-637X. Bibcode: 2015ApJ...815..127W. 
  43. ↑ "KIC 5951458 b". https://exoplanetarchive.ipac.caltech.edu/cgi-bin/DisplayOverview/nph-DisplayOverview?objname=KIC+5951458+b. 
  44. ↑ "KIC 8540376 b". https://exoplanetarchive.ipac.caltech.edu/cgi-bin/DisplayOverview/nph-DisplayOverview?objname=KIC+8540376+b. 
  45. ↑ "KIC 8540376 c". https://exoplanetarchive.ipac.caltech.edu/cgi-bin/DisplayOverview/nph-DisplayOverview?objname=KIC+8540376+c. 
  46. ↑ "KIC 9663113 b". https://exoplanetarchive.ipac.caltech.edu/cgi-bin/DisplayOverview/nph-DisplayOverview?objname=KIC+9663113+b. 
  47. ↑ "KIC 10525077 b". https://exoplanetarchive.ipac.caltech.edu/cgi-bin/DisplayOverview/nph-DisplayOverview?objname=KIC+10525077+b. 
  48. ↑ "KIC 5437945 b". https://exoplanetarchive.ipac.caltech.edu/cgi-bin/DisplayOverview/nph-DisplayOverview?objname=KIC+5437945+b. 
  49. ↑ "TOI-813 b". https://exoplanetarchive.ipac.caltech.edu/cgi-bin/DisplayOverview/nph-DisplayOverview?objname=TOI-813%20b&type=CONFIRMED_PLANET. 
  50. ↑ "Discovery Alert! High School Student Finds a World With Two Suns". https://exoplanets.nasa.gov/news/1619/discovery-alert-high-school-student-finds-a-world-with-two-suns/. 
  51. ↑ "ExoFOP TIC 260128333". https://exofop.ipac.caltech.edu/tess/target.php?id=260128333. 
  52. ↑ "TOI-1338 b". https://exoplanetarchive.ipac.caltech.edu/cgi-bin/DisplayOverview/nph-DisplayOverview?objname=TOI-1338%20b&type=CONFIRMED_PLANET. 
  53. ↑ Kostov, Veselin B.; Orosz, Jerome A.; Feinstein, Adina D.; Welsh, William F.; Cukier, Wolf; Haghighipour, Nader; Quarles, Billy; Martin, David V. et al. (2020-05-07). "TOI-1338: TESS' First Transiting Circumbinary Planet". The Astronomical Journal 159 (6): 253. doi:10.3847/1538-3881/ab8a48. ISSN 1538-3881. Bibcode: 2020AJ....159..253K. 
  54. ↑ 54.0 54.1 Eisner, Nora L.; Nicholson, Belinda A.; Barragán, Oscar; Aigrain, Suzanne; Lintott, Chris; Kaye, Laurel; Klein, Baptiste; Miller, Grant et al. (2021-06-01). "Planet Hunters TESS III: Two transiting planets around the bright G dwarf HD 152843". Monthly Notices of the Royal Astronomical Society 505 (2): 1827–1840. doi:10.1093/mnras/stab1253. 
  55. ↑ "TOI-5174 b". https://exoplanetarchive.ipac.caltech.edu/overview/TIC%2049428710#planet_TOI-5174-b_collapsible. 
  56. ↑ "TOI-5174 b". https://exofop.ipac.caltech.edu/tess/target.php?id=49428710. 
  57. ↑ "PHT talk about the discovery". https://www.zooniverse.org/projects/nora-dot-eisner/planet-hunters-tess/talk/2112/2293439?comment=3764048&page=1. 
  58. ↑ "ExoFOP List of CTOIs". https://exofop.ipac.caltech.edu/tess/view_ctoi.php. 
  59. ↑ "ExoFOP TIC 408636441". https://exofop.ipac.caltech.edu/tess/target.php?id=408636441. 
  60. ↑ Martioli, E.; Hébrard, G.; Fouqué, P.; Artigau, É.; Donati, J. -F.; Cadieux, C.; Bellotti, S.; Lecavelier des Etangs, A. et al. (2022-04-01). "TOI-1759 b: A transiting sub-Neptune around a low mass star characterized with SPIRou and TESS". Astronomy and Astrophysics 660: A86. doi:10.1051/0004-6361/202142540. ISSN 0004-6361. Bibcode: 2022A&A...660A..86M. https://ui.adsabs.harvard.edu/abs/2022A&A...660A..86M. 
  61. ↑ Espinoza, Néstor; Pallé, Enric; Kemmer, Jonas; Luque, Rafael; Caballero, José A.; Cifuentes, Carlos; Herrero, Enrique; Sánchez Béjar, Víctor J. et al. (2022-03-01). "A Transiting, Temperate Mini-Neptune Orbiting the M Dwarf TOI-1759 Unveiled by TESS". The Astronomical Journal 163 (3): 133. doi:10.3847/1538-3881/ac4af0. ISSN 0004-6256. Bibcode: 2022AJ....163..133E. 
  62. ↑ Cañas, Caleb I.; Stefansson, Gudmundur; Kanodia, Shubham; Mahadevan, Suvrath; Cochran, William D.; Endl, Michael; Robertson, Paul; Bender, Chad F. et al. (2020-09-01). "A Warm Jupiter Transiting an M Dwarf: A TESS Single-transit Event Confirmed with the Habitable-zone Planet Finder". The Astronomical Journal 160 (3): 147. doi:10.3847/1538-3881/abac67. ISSN 0004-6256. Bibcode: 2020AJ....160..147C. 
  63. ↑ Dalba, Paul A.; Kane, Stephen R.; Dragomir, Diana; Villanueva, Steven; Collins, Karen A.; Jacobs, Thomas Lee; LaCourse, Daryll M.; Gagliano, Robert et al. (2022-02-01). "The TESS-Keck Survey. VIII. Confirmation of a Transiting Giant Planet on an Eccentric 261 Day Orbit with the Automated Planet Finder Telescope". The Astronomical Journal 163 (2): 61. doi:10.3847/1538-3881/ac415b. ISSN 0004-6256. Bibcode: 2022AJ....163...61D. 
  64. ↑ "ExoFOP TIC 349576261". https://exofop.ipac.caltech.edu/tess/target.php?id=349576261. 
  65. ↑ Heitzmann, Alexis; Zhou, George; Quinn, Samuel N.; Huang, Chelsea X.; Dong, Jiayin; Bouma, Luke G.; Dawson, Rebekah I.; Marsden, Stephen C. et al. (2023). "TOI-4562b: A Highly Eccentric Temperate Jupiter Analog Orbiting a Young Field Star". The Astronomical Journal 165 (3): 121. doi:10.3847/1538-3881/acb5a2. 
  66. ↑ Gies, Douglas R.; Guo, Zhao; Howell, Steve B.; Still, Martin D.; Boyajian, Tabetha S.; Hoekstra, Abe J.; Jek, Kian J.; LaCourse, Daryll et al. (September 2013). "KIC 9406652: An Unusual Cataclysmic Variable in the Kepler Field of View" (in en). Astrophysical Journal 775 (1): 64. doi:10.1088/0004-637X/775/1/64. ISSN 0004-637X. Bibcode: 2013ApJ...775...64G. 
  67. ↑ Kato, Taichi; Osaki, Yoji (April 2014). "GALEX J194419.33+491257.0: An unusually active SU UMa-type dwarf nova with a very short orbital period in the Kepler data" (in en). Publications of the Astronomical Society of Japan 66 (2): L5. doi:10.1093/pasj/psu025. ISSN 0004-6264. Bibcode: 2014PASJ...66L...5K. 
  68. ↑ Boyajian, T. S. (27 January 2016). "Planet Hunters X: KIC 8462852 – Where's the flux?". Monthly Notices of the Royal Astronomical Society 457 (4): 3988–4004. doi:10.1093/mnras/stw218. Bibcode: 2016MNRAS.457.3988B. 
  69. ↑ Bodenner, Chris (16 October 2015). "Maybe It's a Dyson Sphere". Notes. The Atlantic. https://www.theatlantic.com/notes/all/2015/10/maybe-its-a-dyson-sphere/411121/#note-410974. 
  70. ↑ Bodenner, Chris (17 October 2015). "Maybe It's a Dyson Sphere, Cont'd". Notes. The Atlantic. https://www.theatlantic.com/notes/all/2015/10/maybe-its-a-dyson-sphere/411121/#note-411124. 
  71. ↑ Andersen, Ross (13 October 2015). "The Most Mysterious Star in Our Galaxy". The Atlantic. https://www.theatlantic.com/science/archive/2015/10/the-most-interesting-star-in-our-galaxy/410023/. Retrieved 15 June 2017. 
  72. ↑ Schmitt, Joseph R.; Tokovinin, Andrei; Wang, Ji; Fischer, Debra A.; Kristiansen, Martti H.; LaCourse, Daryll M.; Gagliano, Robert; Tan, Arvin Joseff V. et al. (June 2016). "Planet Hunters. X. Searching for Nearby Neighbors of 75 Planet and Eclipsing Binary Candidates from the K2 Kepler extended mission" (in en). The Astronomical Journal 151 (6): 159. doi:10.3847/0004-6256/151/6/159. ISSN 0004-6256. Bibcode: 2016AJ....151..159S. 
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