| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Coma Berenices |
| Right ascension | 13h 12m 19.7428s [2] |
| Declination | +17° 31′ 01.654″ [2] |
| Astrometry | |
| Distance | 126±2
[2]
ly (38.6±0.7 [2] pc) |
| Orbit | |
| Primary | HD 114762 |
| Period (P) | 83.915±0.003 d [3] |
| Semi-major axis (a) | 0.375±0.006 AU [3] |
| Eccentricity (e) | 0.566+0.012 −0.011 [3] |
| Inclination (i) | 6.23+1.97 −1.26 [3]° |
| Periastron epoch (T) | 2449889.106±0.186 [4] |
|
Argument of periastron (ω) (secondary) | 201.3±1.0 [3]° |
| Semi-amplitude (K2) (secondary) | 612.48±3.52 [4] km/s |
| Details | |
| Mass | 107+20 −27 [3] 147.0+39.3 −42.0 [5] MJup |
| Database references | |
| SIMBAD | data |
HD 114762 b is a small red dwarf star, in the HD 114762 system, [3] formerly thought to be a massive gaseous [6] [7] extrasolar planet, [8] approximately 126 light-years (38.6 pc) away in the constellation of Coma Berenices. [1] [6] This optically undetected companion to the late F-type main-sequence star HD 114762 was discovered in 1989 by Latham, et al., [7] and confirmed in an October 1991 paper by Cochran, et al. [9] It was thought to be the first discovered exoplanet (although its existence was confirmed after those around PSR B1257+12.)
The object orbits the primary star every 83.9 days at an approximate distance of 0.37
AU,
[3] with an
orbital eccentricity of 0.57;
[3] for comparison, this orbit is similar to that of
Mercury but with almost three times the eccentricity.
[3] Based on the radial velocity measurements alone, it was estimated to have a minimum mass of 11.069±0.063
MJ (at 90°)
[10] and a probable mass of approximately 63.2
MJ (at 10°).
[11] However, analysis of its astrometric perturbation of its host star in 2019 found it to have an extremely low inclination of only 6.23+1.97
−1.26 degrees, giving it a true mass of 107+20
−27 MJ and putting it well outside of the range of planetary masses (less than 13
MJ).
[3]
HD 114762 b was thought for a time to be the first extrasolar planet ever detected, predating the 1992 pulsar planets found around PSR B1257+12 and main-sequence yellow dwarf 51 Pegasi. [12] [13] However, now that it has been found to not be a planet, the planets found orbiting PSR B1257+12 were indeed the first exoplanets ever found. [3]
At an event celebrating the career of discoverer David Latham and attended by his colleagues and collaborators, the object was informally dubbed "Latham's Planet". [14] However, this name has no official standing with the International Astronomical Union.
See also
References
- ^ a b Butler, R. P.; et al. (2006). "Catalog of Nearby Exoplanets". The Astrophysical Journal. 646 (1): 505–522. arXiv: astro-ph/0607493. Bibcode: 2006ApJ...646..505B. doi: 10.1086/504701. S2CID 119067572.
- ^ a b c d Brown, A. G. A; et al. (2016). "Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties". Astronomy and Astrophysics. 595. A2. arXiv: 1609.04172. Bibcode: 2016A&A...595A...2G. doi: 10.1051/0004-6361/201629512. S2CID 1828208. Gaia Data Release 1 catalog entry
- ^ a b c d e f g h i j k l Kiefer, Flavien (17 October 2019). "Determining the mass of the planetary candidate HD 114762 b using Gaia". Astronomy & Astrophysics. 632: L9. arXiv: 1910.07835. Bibcode: 2019A&A...632L...9K. doi: 10.1051/0004-6361/201936942. S2CID 204743831.
- ^ a b Kane, Stephen R.; et al. (2011). "Revised Orbit and Transit Exclusion for HD 114762b". The Astrophysical Journal Letters. 735 (2). L41. arXiv: 1106.1434. Bibcode: 2011ApJ...735L..41K. doi: 10.1088/2041-8205/735/2/L41. S2CID 118409104.
- ^ Kiefer, F.; et al. (January 2021). "Determining the true mass of radial-velocity exoplanets with Gaia. Nine planet candidates in the brown dwarf or stellar regime and 27 confirmed planets". Astronomy & Astrophysics. 645 A7. arXiv: 2009.14164. Bibcode: 2021A&A...645A...7K. doi: 10.1051/0004-6361/202039168. S2CID 221995447.
- ^ a b North, Gerald (2003). Astronomy in Depth. New York: Springer. p. 185. ISBN 9781852335809.
- ^ a b Latham, David W.; et al. (4 May 1989). "The unseen companion of HD114762: a probable brown dwarf". Nature. 339 (6219): 38–40. Bibcode: 1989Natur.339...38L. doi: 10.1038/339038a0. S2CID 4324036.
- ^ "HD 114762b". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 31 August 2014.
- ^ Cochran, William D.; et al. (10 October 1991). "Constraints on the Companion Object to HD 114762". The Astrophysical Journal. 380: L35–L38. Bibcode: 1991ApJ...380L..35C. doi: 10.1086/186167.
- ^ Wang, Sharon Xuesong; et al. (2012). "The Discovery of HD 37605c and a Dispositive Null Detection of Transits of HD 37605b". The Astrophysical Journal. 761 (1): 46–59. arXiv: 1210.6985. Bibcode: 2012ApJ...761...46W. doi: 10.1088/0004-637X/761/1/46. S2CID 118679173.
- ^ Kane, Stephen R. & Gelino, Dawn M. (2012). "Distinguishing between stellar and planetary companions with phase monitoring". Monthly Notices of the Royal Astronomical Society. 424 (1): 779–788. arXiv: 1205.5812. Bibcode: 2012MNRAS.424..779K. doi: 10.1111/j.1365-2966.2012.21265.x. S2CID 15537565.
- ^ Hale, Alan (1995). "On the Nature of the Companion to HD 114762". Publications of the Astronomical Society of the Pacific. 107 (707). The University of Chicago Press: 22–26. Bibcode: 1995PASP..107...22H. doi: 10.1086/133511. JSTOR 40680489.
- ^ Marcy, Geoffrey W.; et al. (1999). "Two New Candidate Planets in Eccentric Orbits". The Astrophysical Journal. 520 (1): 239–247. arXiv: astro-ph/9904275. Bibcode: 1999ApJ...520..239M. doi: 10.1086/307451. S2CID 16827678.
- ^ Johnson, John (2016). How do you find an Exoplanet?. New Jersey: Princeton University Press. p. 137. ISBN 978-0-691-15681-1.
 | This article about a red dwarf is a stub. You can help Wikipedia by expanding it. |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Coma Berenices |
| Right ascension | 13h 12m 19.7428s [2] |
| Declination | +17° 31′ 01.654″ [2] |
| Astrometry | |
| Distance | 126±2
[2]
ly (38.6±0.7 [2] pc) |
| Orbit | |
| Primary | HD 114762 |
| Period (P) | 83.915±0.003 d [3] |
| Semi-major axis (a) | 0.375±0.006 AU [3] |
| Eccentricity (e) | 0.566+0.012 −0.011 [3] |
| Inclination (i) | 6.23+1.97 −1.26 [3]° |
| Periastron epoch (T) | 2449889.106±0.186 [4] |
|
Argument of periastron (ω) (secondary) | 201.3±1.0 [3]° |
| Semi-amplitude (K2) (secondary) | 612.48±3.52 [4] km/s |
| Details | |
| Mass | 107+20 −27 [3] 147.0+39.3 −42.0 [5] MJup |
| Database references | |
| SIMBAD | data |
HD 114762 b is a small red dwarf star, in the HD 114762 system, [3] formerly thought to be a massive gaseous [6] [7] extrasolar planet, [8] approximately 126 light-years (38.6 pc) away in the constellation of Coma Berenices. [1] [6] This optically undetected companion to the late F-type main-sequence star HD 114762 was discovered in 1989 by Latham, et al., [7] and confirmed in an October 1991 paper by Cochran, et al. [9] It was thought to be the first discovered exoplanet (although its existence was confirmed after those around PSR B1257+12.)
The object orbits the primary star every 83.9 days at an approximate distance of 0.37
AU,
[3] with an
orbital eccentricity of 0.57;
[3] for comparison, this orbit is similar to that of
Mercury but with almost three times the eccentricity.
[3] Based on the radial velocity measurements alone, it was estimated to have a minimum mass of 11.069±0.063
MJ (at 90°)
[10] and a probable mass of approximately 63.2
MJ (at 10°).
[11] However, analysis of its astrometric perturbation of its host star in 2019 found it to have an extremely low inclination of only 6.23+1.97
−1.26 degrees, giving it a true mass of 107+20
−27 MJ and putting it well outside of the range of planetary masses (less than 13
MJ).
[3]
HD 114762 b was thought for a time to be the first extrasolar planet ever detected, predating the 1992 pulsar planets found around PSR B1257+12 and main-sequence yellow dwarf 51 Pegasi. [12] [13] However, now that it has been found to not be a planet, the planets found orbiting PSR B1257+12 were indeed the first exoplanets ever found. [3]
At an event celebrating the career of discoverer David Latham and attended by his colleagues and collaborators, the object was informally dubbed "Latham's Planet". [14] However, this name has no official standing with the International Astronomical Union.
See also
References
- ^ a b Butler, R. P.; et al. (2006). "Catalog of Nearby Exoplanets". The Astrophysical Journal. 646 (1): 505–522. arXiv: astro-ph/0607493. Bibcode: 2006ApJ...646..505B. doi: 10.1086/504701. S2CID 119067572.
- ^ a b c d Brown, A. G. A; et al. (2016). "Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties". Astronomy and Astrophysics. 595. A2. arXiv: 1609.04172. Bibcode: 2016A&A...595A...2G. doi: 10.1051/0004-6361/201629512. S2CID 1828208. Gaia Data Release 1 catalog entry
- ^ a b c d e f g h i j k l Kiefer, Flavien (17 October 2019). "Determining the mass of the planetary candidate HD 114762 b using Gaia". Astronomy & Astrophysics. 632: L9. arXiv: 1910.07835. Bibcode: 2019A&A...632L...9K. doi: 10.1051/0004-6361/201936942. S2CID 204743831.
- ^ a b Kane, Stephen R.; et al. (2011). "Revised Orbit and Transit Exclusion for HD 114762b". The Astrophysical Journal Letters. 735 (2). L41. arXiv: 1106.1434. Bibcode: 2011ApJ...735L..41K. doi: 10.1088/2041-8205/735/2/L41. S2CID 118409104.
- ^ Kiefer, F.; et al. (January 2021). "Determining the true mass of radial-velocity exoplanets with Gaia. Nine planet candidates in the brown dwarf or stellar regime and 27 confirmed planets". Astronomy & Astrophysics. 645 A7. arXiv: 2009.14164. Bibcode: 2021A&A...645A...7K. doi: 10.1051/0004-6361/202039168. S2CID 221995447.
- ^ a b North, Gerald (2003). Astronomy in Depth. New York: Springer. p. 185. ISBN 9781852335809.
- ^ a b Latham, David W.; et al. (4 May 1989). "The unseen companion of HD114762: a probable brown dwarf". Nature. 339 (6219): 38–40. Bibcode: 1989Natur.339...38L. doi: 10.1038/339038a0. S2CID 4324036.
- ^ "HD 114762b". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 31 August 2014.
- ^ Cochran, William D.; et al. (10 October 1991). "Constraints on the Companion Object to HD 114762". The Astrophysical Journal. 380: L35–L38. Bibcode: 1991ApJ...380L..35C. doi: 10.1086/186167.
- ^ Wang, Sharon Xuesong; et al. (2012). "The Discovery of HD 37605c and a Dispositive Null Detection of Transits of HD 37605b". The Astrophysical Journal. 761 (1): 46–59. arXiv: 1210.6985. Bibcode: 2012ApJ...761...46W. doi: 10.1088/0004-637X/761/1/46. S2CID 118679173.
- ^ Kane, Stephen R. & Gelino, Dawn M. (2012). "Distinguishing between stellar and planetary companions with phase monitoring". Monthly Notices of the Royal Astronomical Society. 424 (1): 779–788. arXiv: 1205.5812. Bibcode: 2012MNRAS.424..779K. doi: 10.1111/j.1365-2966.2012.21265.x. S2CID 15537565.
- ^ Hale, Alan (1995). "On the Nature of the Companion to HD 114762". Publications of the Astronomical Society of the Pacific. 107 (707). The University of Chicago Press: 22–26. Bibcode: 1995PASP..107...22H. doi: 10.1086/133511. JSTOR 40680489.
- ^ Marcy, Geoffrey W.; et al. (1999). "Two New Candidate Planets in Eccentric Orbits". The Astrophysical Journal. 520 (1): 239–247. arXiv: astro-ph/9904275. Bibcode: 1999ApJ...520..239M. doi: 10.1086/307451. S2CID 16827678.
- ^ Johnson, John (2016). How do you find an Exoplanet?. New Jersey: Princeton University Press. p. 137. ISBN 978-0-691-15681-1.
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| This article about a red dwarf is a stub. You can help Wikipedia by expanding it. |