HAT-P-41
Star in the constellation Aquila
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HAT-P-41 is a binary star system. Its primary is a F-type main-sequence star. Its surface temperature is 6390±100 K.[6] compared to the Sun, HAT-P-41 is enriched in heavy elements, with a metallicity Fe/H index of 0.21±0.10, but is much younger at an age of 2.2±0.4 billion years.[6]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquila[1] |
| Right ascension | 19h 49m 17.4398s[2] |
| Declination | 04° 40′ 20.786″[2] |
| Apparent magnitude (V) | 11.36[3] |
| Characteristics | |
| HAT-P-41 | |
| Evolutionary stage | main sequence[2] |
| Spectral type | F9V[4] |
| HAT-P-41B | |
| Spectral type | K9-M0[4] |
| Astrometry | |
| Radial velocity (Rv) | 33.2±0.5[2] km/s |
| Proper motion (μ) | RA: −3.177[2] mas/yr Dec.: −6.570[2] mas/yr |
| Parallax (π) | 2.8477±0.0176 mas[2] |
| Distance | 1,145 ± 7 ly (351 ± 2 pc) |
| Position (relative to HAT-P-41)[4] | |
| Component | HAT-P-41B |
| Epoch of observation | 2013 |
| Angular distance | 3.619±0.005″ |
| Position angle | 184.1±0.2° |
| Projected separation | 1270 AU |
| Orbit[5] | |
| Primary | HAT-P-41 A |
| Name | HAT-P-41 B |
| Semi-major axis (a) | 1,269 AU |
| Details[6] | |
| Mass | 1.418±0.047 M☉ |
| Radius | 1.683+0.058 −0.036 R☉ |
| Temperature | 6390±100 K |
| Metallicity [Fe/H] | 0.21±0.10 dex |
| Rotational velocity (v sin i) | 19.60±0.50 km/s |
| Age | 2.2±0.4 Gyr |
| Other designations | |
| TYC 488-2442-1, GSC 00488-02442, 2MASS J19491743+0440207[7] | |
| HAT-P-41: Gaia DR2 4290415081653653632, Gaia DR3 4290415081653653632 | |
| HAT-P-41B: Gaia DR2 4290415081653653376, Gaia DR3 4290415081653653376 | |
| Database references | |
| SIMBAD | data |
| Hat-P-41b | |
The candidate stellar companion was detected simultaneously with the planet discovery in 2012.[8] A multiplicity survey in 2015 did confirm a dim stellar companion of later-K to early-M spectral class, with the probability of being a background star of 14%.[4] By 2020, it was concluded the candidate companion star is probably gravitationally bound.[5]
Planetary system
In 2012, one planet, named HAT-P-41b, was discovered on a tight, circular orbit around the primary star.[8]
The planetary orbit is mildly misaligned with the equatorial plane of the star, misalignment angle equal to −22.1+0.8
−6.0 degrees.[9]
The transmission spectrum of HAT-P-41b taken in 2020 has resulted in contradictory interpretations. One team has concluded the planetary atmosphere is metal-rich, with clear water signatures and absorption bands from sodium, aluminum, titanium and vanadium compounds.[10] Another team has interpreted the results as arising from a dense hydrogen atmosphere without detectable heavy elements, but with significant ionization.[11] The atmosphere also appears to contain significant cloud and hazes.[12] Neither heavy element compounds nor H− ion opacity were found in 2022 study.[13]
The planetary equilibrium temperature is within 1700-1950 K,[11] and the dayside temperature has been measured at 1622±125 K.[14]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 0.795+0.056 −0.091 MJ |
0.04258+0.00047 −0.00048 |
2.694047±0.000004 | <0.22 | 87.7±1.0° | 1.685+0.076 −0.051 RJ |