Astronomy:WASP-78
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Eridanus |
| Right ascension | 04h 15m 01.5044s[1] |
| Declination | −22° 06′ 59.1039″[1] |
| Apparent magnitude (V) | 12.0[2] |
| Characteristics | |
| Evolutionary stage | main-sequence star[citation needed] |
| Spectral type | F8[2] |
| Astrometry | |
| Radial velocity (Rv) | 1.26[1] km/s |
| Proper motion (μ) | RA: -0.463[1] mas/yr Dec.: 6.424[1] mas/yr |
| Parallax (π) | 1.2968 ± 0.0292[3] mas |
| Distance | 2,520 ± 60 ly (770 ± 20 pc) |
| Details | |
| Mass | 1.33±0.09[2] M☉ |
| Radius | 2.20±0.12[2] R☉ |
| Luminosity | 5.8±0.2[3] L☉ |
| Surface gravity (log g) | 3.88±0.04[2] cgs |
| Temperature | 6100±150[2] K |
| Metallicity [Fe/H] | -0.35±0.14[2] dex |
| Rotation | 0.4±0.4[2] |
| Rotational velocity (v sin i) | 6.63±0.16[4] km/s |
| Age | 3.4+1.5−0.8[4] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
WASP-78, is a single F-type main-sequence star about 2500 light-years away. It is likely to be younger than the Sun at 3.4+1.5−0.8 billion years.[4] WASP-78 is depleted in heavy elements, having a 45% concentration of iron compared to the Sun.
Planetary system
In 2012 a transiting hot Jupiter planet b was detected on a circular orbit. The planetary equilibrium temperature is 2350±80 K,[2] while the nightside temperature measured in 2019 is 2200±41 K.[5] The dayside planetary temperature measured in 2020 is 2560±130 K.[6]
A survey in 2016 measured a Rossiter-McLaughlin effect and found the planetary orbit is well aligned with the equatorial plane of the star, misalignment equal to −6.4±5.9°[4] The planet cannot have formed in its current orbit and has likely undergone in the past a migration from the initial highly eccentric orbit.[7]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 0.89±0.08 MJ | 0.0362±0.0008 | 2.17517632±0.0000047 | 0 | 83.2+2.3−1.6° | 1.70±0.11 RJ |
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 "WASP-78". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=WASP-78.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 Smalley, B.; Anderson, D. R.; Collier-Cameron, A.; Doyle, A. P.; Fumel, A.; Gillon, M.; Hellier, C.; Jehin, E. et al. (2012), "WASP-78b and WASP-79b: Two highly-bloated hot Jupiter-mass exoplanets orbiting F-type stars in Eridanus", Astronomy & Astrophysics 547: A61, doi:10.1051/0004-6361/201219731, Bibcode: 2012A&A...547A..61S
- ↑ 3.0 3.1 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 4.0 4.1 4.2 4.3 Brown, D. J. A.; Triaud, A. H. M. J.; Doyle, A. P.; Gillon, M.; Lendl, M.; Anderson, D. R.; Collier Cameron, A.; Hébrard, G. et al. (2016), "Rossiter–McLaughlin models and their effect on estimates of stellar rotation, illustrated using six WASP systems", Monthly Notices of the Royal Astronomical Society 464: 810–839, doi:10.1093/mnras/stw2316
- ↑ Garhart, Emily; Deming, Drake; Mandell, Avi; Knutson, Heather A.; Wallack, Nicole; Burrows, Adam; Fortney, Jonathan J.; Hood, Callie et al. (2020), "Statistical Characterization of Hot Jupiter Atmospheres Using Spitzer's Secondary Eclipses", The Astronomical Journal 159 (4): 137, doi:10.3847/1538-3881/ab6cff, Bibcode: 2020AJ....159..137G
- ↑ Wong, Ian; Shporer, Avi; Daylan, Tansu; Benneke, Björn; Fetherolf, Tara; Kane, Stephen R.; Ricker, George R.; Vanderspek, Roland et al. (2020), "Systematic phase curve study of known transiting systems from year one of the TESS mission", The Astronomical Journal 160 (4): 155, doi:10.3847/1538-3881/ababad, Bibcode: 2020AJ....160..155W
- ↑ Valsecchi, Francesca (2014), "Planets on the Edge", The Astrophysical Journal 787 (1): L9, doi:10.1088/2041-8205/787/1/L9, Bibcode: 2014ApJ...787L...9V
Coordinates: 
04h 15m 01.5044s, −22° 06′ 59.1039″
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