Astronomy:Kepler-1625

From HandWiki
Short description: Star with exoplanet and a potential exomoon
Kepler-1625
Observation data
Equinox J2000.0]] (ICRS)
Constellation Cygnus
Right ascension  19h 41m 43.04008s[1]
Declination +39° 53′ 11.4990″[1]
Characteristics
Apparent magnitude (K) 13.916[2]
Astrometry
Proper motion (μ) RA: −2.088(32)[1] mas/yr
Dec.: −4.804(32)[1] mas/yr
Parallax (π)0.4548 ± 0.0289[1] mas
Distance7,200 ± 500 ly
(2,200 ± 100 pc)
Details
Mass1.04±0.08[3] M☉
Radius1.73±0.24[3] R☉
Luminosity (bolometric)2.57±0.68[3] L☉
Surface gravity (log g)3.99±0.10[3] cgs
Temperature5563±86[3] K
Metallicity [Fe/H]0.06±0.13[3] dex
Age8.7±2.1[3] Gyr
Other designations
Kepler-1625, KOI-5084, KIC 4760478, 2MASS J19414304+3953115[4]
Database references
SIMBADdata

Kepler-1625 is a 14th-magnitude solar-mass star located in the constellation of Cygnus approximately 7,200 light-years (2,200 parsecs) away. Its mass is within 5% of that of the Sun, but its radius is approximately 70% larger reflecting its more evolved state. A candidate gas giant exoplanet was detected by the Kepler Mission around the star in 2015,[5] which was later validated as a real planet to >99% confidence in 2016.[6] In 2018, the Hunt for Exomoons with Kepler project reported evidence for a Neptune-sized exomoon around this planet, based on observations from NASA’s Kepler mission and the Hubble Space Telescope.[7][3] Subsequently, the evidence for and reality of this exomoon candidate has been subject to debate.[8][9][10][11]

Stellar characteristics

Kepler-1625 is an approximately solar-mass star and yet is 1.7 times larger in diameter.[3] Its effective temperature is around 5,550 K, slightly lower than that of the Sun.[12][3] These parameters suggest that Kepler-1625 may be a yellow subgiant nearing the end of its life, with an age of approximately 8.7 billion years.[3] The star has been observed to be photometrically quiet, with periodic variability below 0.02%.[10] Kepler-1625 is located approximately 7,200 light-years away[1] in the constellation Cygnus.[12]

Planetary system

The Kepler-1625 planetary system[3]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b ≤11.6[13] MJ 0.98±0.14 287.3727±0.0022 — 89.97±0.02° 11.4±1.6 R⊕

The star is known to have one validated planet. Designated Kepler-1625b, it is a Jovian-sized planet orbiting its star every 287.3 Earth days. No other candidate transiting planets have been found around the star.[10]

Potential exomoon

Main page: Astronomy:Kepler-1625b I

The Kepler Mission recorded three planetary transits of Kepler-1625b from 2009 to 2013.[5] From these, anomalous out-of-transit flux decrements indicated the possible existence of a Neptune-sized exomoon, as first reported by the Hunt for Exomoons with Kepler project in 2018.[7] The Kepler data were inconclusive and so the planetary transit was re-observed by the Hubble Space Telescope in October 2018. The light curve from Hubble exhibited evidence for both a moon-like transit and a transit timing variation, both of which were consistent as being caused by the same Neptune-sized moon in orbit of Kepler-1625b.[3] The transit timing variation has been independently recovered by two teams analyzing the same data.[8][9] One of these teams also independently recovered the moon-like transit, but suggest that radial velocity measurements are needed to exclude the possibility of a close-in masquerading planet.[8] The other team are unable to recover the moon-like transit and suggested it may be an artifact of the data reduction.[9] This conclusion was challenged by the original team soon after, who showed that the other analysis exhibits larger systematics that may explain their differing conclusion.[10]

See also

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  2. ↑ "NASA Exoplanet archive". https://exoplanetarchive.ipac.caltech.edu/. 
  3. ↑ 3.00 3.01 3.02 3.03 3.04 3.05 3.06 3.07 3.08 3.09 3.10 3.11 3.12 Teachey, Alex; Kipping, David M. (2018). "Evidence for a Large Exomoon Orbiting Kepler-1625b". Science Advances 4 (10): eaav1784. doi:10.1126/sciadv.aav1784. PMID 30306135. PMC 6170104. Bibcode: 2018SciA....4.1784T. http://imgsrc.hubblesite.org/hvi/uploads/science_paper/file_attachment/357/Teachey_and_Kipping_2018_Evidence_for_a_large_exomoon_orbiting_Kepler1625b_Science_Advances_with_SM_small.pdf. Retrieved 2019-04-25. 
  4. ↑ "Kepler-1625". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Kepler-1625. 
  5. ↑ 5.0 5.1 Mullally, Fergus et al. (2015). "Planetary Candidates Observed by Kepler. VI. Planet Sample from Q1--Q16 (47 Months)". The Astrophysical Journal 217 (2): 31. doi:10.1088/0067-0049/217/2/31. Bibcode: 2015ApJS..217...31M. 
  6. ↑ Morton, Timothy D. et al. (2016). "False Positive Probabilities for all Kepler Objects of Interest: 1284 Newly Validated Planets and 428 Likely False Positives". The Astrophysical Journal 822 (2): 86. doi:10.3847/0004-637X/822/2/86. Bibcode: 2016ApJ...822...86M. 
  7. ↑ 7.0 7.1 Teachey, Alex et al. (2018). "HEK VI: On the Dearth of Galilean Analogs in Kepler and the Exomoon Candidate Kepler-1625b I". The Astronomical Journal 155 (1): 36. doi:10.3847/1538-3881/aa93f2. Bibcode: 2018AJ....155...36T. 
  8. ↑ 8.0 8.1 8.2 Heller, Rene; Rodenbeck, Kai; Giovanni, Bruno (2019). "An alternative interpretation of the exomoon candidate signal in the combined Kepler and Hubble data of Kepler-1625". Astronomy and Astrophysics 624: 95. doi:10.1051/0004-6361/201834913. Bibcode: 2019A&A...624A..95H. 
  9. ↑ 9.0 9.1 9.2 Kreidberg, Laura; Luger, Rodrigo; Bedell, Megan (June 2019). "No Evidence for Lunar Transit in New Analysis of Hubble Space Telescope Observations of the Kepler-1625 System". The Astrophysical Journal Letters 877 (2): L15. doi:10.3847/2041-8213/ab20c8. Bibcode: 2019ApJ...877L..15K. 
  10. ↑ 10.0 10.1 10.2 10.3 Teachey, Alex; Kipping, David M.; Burke, Christopher (2019). "Loose Ends for the Exomoon Candidate Host Kepler-1625b". The Astronomical Journal 159 (4): 142. doi:10.3847/1538-3881/ab7001. Bibcode: 2020AJ....159..142T. 
  11. ↑ Heller, René; Hippke, Michael (December 2023). "Large exomoons unlikely around Kepler-1625 b and Kepler-1708 b". Nature Astronomy. doi:10.1038/s41550-023-02148-w. Bibcode: 2023NatAs.tmp..258H. 
  12. ↑ 12.0 12.1 Mathur, Savita; Huber, Daniel; Batalha, Natalie M.; Ciardi, David R.; Bastien, Fabienne A.; Bieryla, Allyson; Buchhave, Lars A.; Cochran, William D. et al. (2017). "Revised Stellar Properties of Kepler Targets for the Q1-17 (DR25) Transit Detection Run". The Astrophysical Journal Supplement Series 229 (2): 30. doi:10.3847/1538-4365/229/2/30. Bibcode: 2017ApJS..229...30M. 
  13. ↑ Timmermann, Anina; Heller, Rene; Reiner, Ansgar; Zechmeister, Mathias (2020). "Radial velocity constraints on the long-period transiting planet Kepler-1625 b with CARMENES". Astronomy and Astrophysics 635: 59. doi:10.1051/0004-6361/201937325. Bibcode: 2020A&A...635A..59T. 

Coordinates: Sky map 19h 41m 43.04s, +39° 53′ 11.6″



Retrieved from "https://handwiki.org/wiki/index.php?title=Astronomy:Kepler-1625&oldid=3428222"