TOI-4138 b

TOI-4138 b is a transiting exoplanet orbiting the G-type subgiant TOI-4138 1,674 light years away in the northern circumpolar constellation Ursa Minor.

TOI-4138 b
TOI-4138 b compared to Jupiter
Discovery[1]
Discovered byMontalto et al.
Discovery siteTESS
Discovery date13 October 2021
Transit
Orbital characteristics[1]
Periastron0.049 AU (7,300,000 km)
Apoastron0.052 AU (7,800,000 km)
0.051 ± 0.002 AU (7,630,000 ± 300,000 km)
Eccentricity0.03 ± 0.02
3.660028 ± 0.000006 d
Inclination86.0°±0.7°
2,458,708.9983 ± 0.0003 JD
Semi-amplitude74±3 m/s
StarTOI-4138
Physical characteristics[1]
Mean radius
1.49 ± 0.04 RJ
Mass0.67 ± 0.03 MJ
Mean density
250 ± 20 kg/m3 (421 ± 34 lb/cu yd)
Temperature1,762 ± 21 K (2,711.9 ± 37.8 °F; 1,488.8 ± 21.0 °C)

    Discovery

    The planet was recently discovered by TESS using the Transit, which involves measuring light curves during a planet’s eclipse. The paper states that it’s inflated due to heating from its host, which has a high luminosity. [2] Its discovery was announced in October of 2021.

    Properties

    Orbit and mass

    TOI-4138 b has an orbital period of 3.6 days, typical for a hot Jupiter. This corresponds to a separation from its host close to one eighth of the distance of Mercury from the Sun. Since the inclination is known, doppler spectroscopy measurements give the planet a mass only 67% that of Jupiter.[1]

    Characteristics

    TOI-4138 b’s transit gives it a radius 149% that of Jupiter; this combined with its low mass gives it a density only 25% that of water. Its separation is comparable with HD 209458 b, but is much larger due to the evolved state of the host star.[1]

    References
    1. Montalto, M.; Malavolta, L.; Gregorio, J.; Mantovan, G.; Desidera, S.; Piotto, G.; Nascimbeni, V.; Granata, V.; Manthopoulou, E. E.; Claudi, R. (January 2022). "TIC 257060897b: An inflated, low-density, hot-Jupiter transiting a rapidly evolving subgiant star". Monthly Notices of the Royal Astronomical Society. 509 (2): 2908–2919. arXiv:2110.00489. Bibcode:2022MNRAS.509.2908M. doi:10.1093/mnras/stab2923. ISSN 0035-8711.
    2. Davis, Margaret (12 October 2021). "NASA Discovered "Hot Jupiter" Exoplanet, Bigger But Less Massive Than Solar System's Largest Planet". Science Times. Retrieved 23 December 2021.
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