2018A&A...612A..25K


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.12CEST12:46:43

2018A&A...612A..25K - Astronomy and Astrophysics, volume 612A, 25-25 (2018/4-1)

Young planets under extreme UV irradiation. I. Upper atmosphere modelling of the young exoplanet K2-33b.

KUBYSHKINA D., LENDL M., FOSSATI L., CUBILLOS P.E., LAMMER H., ERKAEV N.V. and JOHNSTONE C.P.

Abstract (from CDS):

The K2-33 planetary system hosts one transiting ∼5R planet orbiting the young M-type host star. The planet's mass is still unknown, with an estimated upper limit of 5.4MJ. The extreme youth of the system (<20Myr) gives the unprecedented opportunity to study the earliest phases of planetary evolution, at a stage when the planet is exposed to an extremely high level of high-energy radiation emitted by the host star. We perform a series of 1D hydrodynamic simulations of the planet's upper atmosphere considering a range of possible planetary masses, from 2 to 40M, and equilibrium temperatures, from 850 to 1300K, to account for internal heating as a result of contraction. We obtain temperature profiles mostly controlled by the planet's mass, while the equilibrium temperature has a secondary effect. For planetary masses below 7-10M, the atmosphere is subject to extremely high escape rates, driven by the planet's weak gravity and high thermal energy, which increase with decreasing mass and/or increasing temperature. For higher masses, the escape is instead driven by the absorption of the high-energy stellar radiation. A rough comparison of the timescales for complete atmospheric escape and age of the system indicates that the planet is more massive than 10M.

Abstract Copyright: © ESO 2018

Journal keyword(s): stars: low mass - stars: late type - planets and satellites: general

Simbad objects: 3

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Number of rows : 3

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 K2-33b Pl 16 10 14.7378782154 -19 19 09.407200797           ~ 28 0
2 K2-33 pr* 16 10 14.7378782154 -19 19 09.407200797   17.353       M2e 30 0
3 NAME Upper Sco Association As* 16 12 -23.4           ~ 1021 1

    Equat.    Gal    SGal    Ecl

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2020.07.12-12:46:43

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