Astronomy:TOI 1338

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Short description: Binary star system in the constellation Pictor found on January 9th, 2020
TOI 1338
TOI1338-starmap.png
Position of TOI 1338 in Pictor
Observation data
Equinox J2000.0]] (ICRS)
Constellation Pictor
Right ascension  06h 08m 31.94s.[1]
Declination −59° 32′ 27.55″.[1]
Apparent magnitude (V) 11.72[2]
Characteristics
Spectral type F8[3]
Variable type eclipsing[3]
Astrometry
Radial velocity (Rv)24.68±8.08[4] km/s
Proper motion (μ) RA: −12.258±0.037[4] mas/yr
Dec.: 34.405±0.041[4] mas/yr
Parallax (π)2.4774 ± 0.0196[4] mas
Distance1,320 ± 10 ly
(404 ± 3 pc)
Orbit[2]
Period (P)14.608559+0.00013
−0.00012 d
Semi-major axis (a)0.1321+0.0024
−0.0025 astronomical unit|AU
Eccentricity (e)0.15603±0.00015
Inclination (i)89.696+0.178
−0.114°
Semi-amplitude (K1)
(primary)		21.619±0.007 km/s
Details[2]
TOI 1338 A
Mass1.127+0.068
−0.069 M☉
Radius1.331+0.024
−0.026 R☉
Luminosity2.133[4] L☉
Surface gravity (log g)4.0 cgs
Temperature6,160 K
Metallicity [Fe/H]+0.01 dex
Rotation19±3 d
Rotational velocity (v sin i)3.6 km/s
Age4.4 Gyr
TOI 1338 B
Mass0.3128+0.0113
−0.0118 M☉
Radius0.3089+0.0056
−0.0060 R☉
Other designations
TYC 8533-950-1, EBLM J0608-59, 2MASS J06083197-5932280, RAVE J060832.0-593228
Database references
SIMBADdata
Extrasolar Planets
Encyclopaedia		data

TOI 1338 is a binary star system located in the constellation Pictor, about 1,320 light-years from Earth.[2] It is orbited by the circumbinary planet TOI 1338 b, discovered by the Transiting Exoplanet Survey Satellite (TESS).[1][4]

Nomenclature and history

The acronym TOI stands for "TESS Objects of Interest." The planet was found by Wolf Cukier, a high school student, who joined the Goddard Space Flight Center as a summer intern. He looked through light curves that were flagged as eclipsing binaries by volunteers of the Planet Hunters citizen science project.[5] Cukier and six of the planet hunter volunteers are co-authors of the publication.[2]

The name "Wolftopia" was suggested by Wolf Cukier's brother. Cukier was not allowed to name the planet.[6]

In February 2021, a petition calling for the planet TOI 1338 b in the system to be named SOPHIE received over 90,000 signatures.[7] Organisers of the petition sought to pay homage to the late Scottish musician and music producer Sophie, who died on 30 January 2021.[8] High-profile supporters of the campaign included Charli XCX and Caroline Polachek.[7]

The stellar binary

TOI 1338 is a single-lined spectroscopic binary system, consisting of an F8 star and a red dwarf of spectral type M. The system has an age of 4.4 billion years. The two stars with masses of 1.13 and 0.313 M☉ revolve around each other every 14.6 days. The red dwarf is about nine magnitudes fainter than the primary star and cannot be detected in the spectrum.[9][2]

The orbit of the two stars is inclined at 89.7° and both primary and secondary eclipses can be observed, although the brightness changes are very small. The primary eclipse occurs when the hotter primary star is partially occulted by the cooler secondary. It lasts about five hours and the brightness decreases by about 4%. The secondary eclipses occur when the cooler star is occulted by the hotter star. They also last about five hours but the brightness drops by less than half a percent.[2]

Planetary system

Artist's impression of the TOI 1338b exoplanet.

The planet TOI 1338b is between Neptune and Saturn in size, and has an orbit that is within ~1° coplanar with the binary.[2] The spin of the primary star also aligns with the orbits of the binary and the planet (spin-orbit angle β = 2.8±17.1 °). This is the second time the Rossiter–McLaughlin effect was measured for a star hosting a circumbinary planet. Kepler-16 was the first system with such a measurement. The measurement of the alignment for TOI 1338 suggests that the planet formed from a single circumbinary disk.[10]

The TOI 1338 planetary system[2]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b 33.0±20.0 M⊕ 0.4607+0.0084
−0.0088 		95.174+0.031
−0.035 		0.0880+0.0043
−0.0033 		89.37+0.35
−0.26° 		6.85±0.19 R⊕

See also

References

  1. ↑ 1.0 1.1 1.2 "ExoFOP TIC 260128333". https://exofop.ipac.caltech.edu/tess/target.php?id=260128333. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 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. http://arxiv.org/abs/2004.07783. 
  3. ↑ 3.0 3.1 Triaud, Amaury H. M. J.; Martin, David V.; Ségransan, Damien; Smalley, Barry; Maxted, Pierre F. L.; Anderson, David R.; Bouchy, François; Collier Cameron, Andrew et al. (2017). "The EBLM Project. IV. Spectroscopic orbits of over 100 eclipsing M dwarfs masquerading as transiting hot Jupiters". Astronomy and Astrophysics 608: A129. doi:10.1051/0004-6361/201730993. Bibcode: 2017A&A...608A.129T. 
  4. ↑ 4.0 4.1 4.2 4.3 4.4 4.5 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. https://www.aanda.org/articles/aa/abs/2018/08/aa33051-18/aa33051-18.html. 
  5. ↑ "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/. 
  6. ↑ Morrison, Hannah (16 January 2020). "Meet the NASA intern who discovered a new planet on his third day". BBC News (London, England). https://www.bbc.com/news/newsbeat-51122019. 
  7. ↑ 7.0 7.1 "SOPHIE fans call for NASA to name a planet after the late musician". 3 February 2021. https://www.dazeddigital.com/music/article/51836/1/sophie-fans-call-for-nasa-to-name-planet-after-the-late-musician-charli-xcx. 
  8. ↑ Richards, Will (30 January 2021). "DJ and producer SOPHIE has died". NME. https://www.nme.com/news/music/dj-and-producer-sophie-has-died-2868461. 
  9. ↑ Martin, David V.; Triaud, Amaury H. M. J.; Udry, Stephane; Marmier, Maxime; Maxted, Pierre F. L.; Cameron, Andrew Collier; Hellier, Coel; Pepe, Francesco et al. (April 2019). "The BEBOP radial-velocity survey for circumbinary planets I. Eight years of CORALIE observations of 47 single-line eclipsing binaries and abundance constraints on the masses of circumbinary planets". Astronomy & Astrophysics 624: A68. doi:10.1051/0004-6361/201833669. ISSN 0004-6361. Bibcode: 2019A&A...624A..68M. 
  10. ↑ Kunovac Hodzic, Vedad; Triaud, Amaury H. M. J.; Martin, David V.; Fabrycky, Daniel C.; Cegla, Heather M.; Collier Cameron, Andrew; Gill, Samuel; Hellier, Coel et al. (2020-07-01). "The EBLM project - VII. Spin-orbit alignment for the circumbinary planet host EBLM J0608-59 A/TOI-1338 A". Monthly Notices of the Royal Astronomical Society 497 (2): 1627–1633. doi:10.1093/mnras/staa2071. Bibcode: 2020MNRAS.497.1627K. http://adsabs.harvard.edu/abs/2020MNRAS.497.1627K. 

External links




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