User:Mike s/draft2
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K2-36 is a K-dwarf orbited by two small, close-in transiting planets, identified through observations by the Kepler space telescope.[3] Adaptive optics imaging failed to detect any stellar companions near K2-36[9] and an analysis of measurements taken by the HARPS-N spectrograph showed no evidence for more than one component.[3] A possible common proper motion companion was noted in 2004.[10]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Leo[1] |
| Right ascension | 11h 17m 47.7836s[2] |
| Declination | 03° 51′ 59.006″[2] |
| Apparent magnitude (V) | 10.165(46)< |
| Characteristics | |
| Evolutionary stage | Main sequence[3] |
| Spectral type | K3[4] |
| Apparent magnitude (J) | 10.034(22)[5] |
| Apparent magnitude (H) | 9.549(22)[5] |
| Apparent magnitude (K) | 9.454(25)[5] |
| Variable type | Planetary transit[3] |
| Astrometry | |
| Radial velocity (Rv) | 13.45(89)[2] km/s |
| Proper motion (μ) | RA: −20.400(17) mas/yr[2] Dec.: 26.329(17) mas/yr[2] |
| Parallax (π) | 9.1653±0.0172 mas[2] |
| Distance | 355.9 ± 0.7 ly (109.1 ± 0.2 pc) |
| Details[6] | |
| Mass | 0.75(3) M☉ |
| Radius | 0.72(2) R☉ |
| Surface gravity (log g) | 4.6(1) cgs |
| Temperature | 4841(100) K |
| Metallicity [Fe/H] | −0.03(4) dex |
| Rotation | 16.7(1.9) d[3] |
| Rotational velocity (v sin i) | 2.31(53)[7] km/s |
| Age | ~1[3] Gyr |
| Other designations | |
| EPIC 201713348, TYC 266-622-1, 2MASS J11174778+0351590, Gaia DR3 3811989156889528320[8] | |
Planetary system
Discovery
During a search for transiting planet candidates in the data from the kepler space telescope's K2 mission a total of 234 planetary candidates around 208 stars were detected. Included were two candidates around the star later named K2-36.[11] The two candidate planets were later statistically validated at greater than 99% to be actual planets rather than false positives.[9] [3]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 3.9(1.1)[6] M🜨 | 0.02288(10) | 1.422614(38) | <0.093 | 84.45+0.78 −0.48° |
1.43(8)[6] R🜨 |
| c | 7.9(2.8) M🜨 | 0.05528(23) | 5.3410507(257)[13] | <0.089 | 86.917+0.066 −0.056° |
3.20(30) R🜨 |