V1298 Tauri: Difference between revisions
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== References == |
== References == |
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[[Category:Planetary systems with four confirmed planets]] |
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[[Category:Pre-main-sequence stars]] |
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[[Category:T Tauri stars]] |
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[[Category:K-type stars]] |
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[[Category:Taurus (constellation)]] |
Revision as of 13:55, 23 February 2020
![]() The planetary system V1298 Tauri Credit: Exoplanet Exploration Program and the Jet Propulsion Laboratory for NASA’s Astrophysics Division | |
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Taurus |
Right ascension | 04h 05m 19.59121s[1] |
Declination | +20° 09′ 25.5635″[1] |
Apparent magnitude (V) | 10.12 |
Characteristics | |
Spectral type | K0-K1.5[2] |
Astrometry | |
Proper motion (μ) | RA: 5.228 ± 0.131[1] mas/yr Dec.: -16.077 ± 0.048[1] mas/yr |
Parallax (π) | 9.2139 ± 0.0593 mas[1] |
Distance | 354 ± 2 ly (108.5 ± 0.7 pc) |
Details | |
Mass | 1.101+0.049 −0.051[3] M☉ |
Radius | 1.345+0.056 −0.051[3] R☉ |
Luminosity | 0.934 ± 0.044[2] L☉ |
Temperature | 4970 ± 120[2] K |
Age | 23 ± 4[2] Myr |
Other designations | |
Database references | |
SIMBAD | data |
V1298 Tauri is a young (23±4 Myr) weakly-lined T Tauri star[3] that is part of the Taurus-Auriga association in the Taurus Molecular Cloud. Alternatively it is part of a proposed moving group, called Group 29 that is slightly older.[4][5][2] The system has four transiting exoplanets, discovered with the Kepler space telescope in the K2 mission.[3] One of the planets was discovered in August 2019[2] and the other three were discovered in November 2019 by the same team.[3]
Stellar characteristics
V1298 Tauri has a spectral type of K0 - K1.5 and it has a mass of about 1.1 M☉. The star appears in x-rays from ROSAT data and it does show strong lithium absorption lines, both signatures of youth and therefore it was a proposed member of Taurus-Auriga. On the other hand it does not show signs of accretion and it lacks infrared excess. Instead it shows H-alpha in absorption.[2]
The light curve of the star shows quasi-periodic variability that was interpreted as stellar rotation and starspots. The light curve also showed several flares.[2]
Based on Gaia DR2 data this star is part of a co-moving pair, together with HD 284154.[4]
Planetary System
V1298 Tauri has four confirmed planets of which planets c, d and b are near a 1:2:3 resonance (with periods of 8.25, 12.40 and 24.14 days). Planet e only shows a single transit in the K2 light curve and has a period larger than 36 days. Planet e might be in a low-order resonance (of 2:3, 3:5, 1:2, or 1:3) with planet b. The system is very young and might be a precursor of a compact multiplanet system. The 2:3 resonance suggests that some close-in planets may either form in resonances or evolve into them on timescales of less than 10 Myr. The planets in the system have a size between Neptune and Saturn. Only planet b has a size similar to Jupiter.[3]
Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
c | — | 0.0825 ± 0.0013 | 8.24958 ± 0.00072 | <0.43 | 88.49+0.92 −0.72° |
0.499+0.032 −0.029 RJ |
d | — | 0.1083 ± 0.0017 | 12.4032 ± 0.0015 | <0.21 | 89.04+0.65 −0.73° |
0.572+0.040 −0.035 RJ |
b | — | 0.1688 ± 0.0026 | 24.1396 ± 0.0018 | <0.29 | 89.00+0.46 −0.24° |
0.916+0.052 −0.047 RJ |
e | — | 0.308+0.182 −0.066 |
60+60 −18 |
<0.57 | 89.40+0.26 −0.18° |
0.780+0.075 −0.064 RJ |
See also
- List of nearby stellar associations and moving groups
- Kepler-223 - the first confirmed system with four exoplanets in resonance
- K2-138 - a system with five exoplanets in a 3:2 resonance chain
References
- ^ a b c d e Gaia Collaboration (2018-08-01). "Gaia Data Release 2 - Summary of the contents and survey properties". Astronomy & Astrophysics. 616: A1. arXiv:1804.09365. doi:10.1051/0004-6361/201833051. ISSN 0004-6361.
- ^ a b c d e f g h David, Trevor J.; Cody, Ann Marie; Hedges, Christina L.; Mamajek, Eric E.; Hillenbrand, Lynne A.; Ciardi, David R.; Beichman, Charles A.; Petigura, Erik A.; Fulton, Benjamin J.; Isaacson, Howard T.; Howard, Andrew W. (August 2019). "A Warm Jupiter-sized Planet Transiting the Pre-main-sequence Star V1298 Tau". AJ. 158 (2): 79. doi:10.3847/1538-3881/ab290f. ISSN 0004-6256.
{{cite journal}}
: CS1 maint: unflagged free DOI (link) - ^ a b c d e f g David, Trevor J.; Petigura, Erik A.; Luger, Rodrigo; Foreman-Mackey, Daniel; Livingston, John H.; Mamajek, Eric E.; Hillenbrand, Lynne A. (2019-10-29). "Four Newborn Planets Transiting the Young Solar Analog V1298 Tau". The Astrophysical Journal. 885 (1): L12. arXiv:1910.04563. Bibcode:2019ApJ...885L..12D. doi:10.3847/2041-8213/ab4c99. ISSN 2041-8213.
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: CS1 maint: unflagged free DOI (link) - ^ a b Oh, Semyeong; Price-Whelan, Adrian M.; Hogg, David W.; Morton, Timothy D.; Spergel, David N. (June 2017). "Comoving Stars in Gaia DR1: An Abundance of Very Wide Separation Comoving Pairs". AJ. 153 (6): 257. doi:10.3847/1538-3881/aa6ffd. ISSN 0004-6256.
{{cite journal}}
: CS1 maint: unflagged free DOI (link) - ^ Luhman, K. L. (December 2018). "The Stellar Membership of the Taurus Star-forming Region". AJ. 156 (6): 271. doi:10.3847/1538-3881/aae831. ISSN 0004-6256.
{{cite journal}}
: CS1 maint: unflagged free DOI (link)