2020A&A...641A..23P


C.D.S. - SIMBAD4 rel 1.7 - 2020.12.05CET00:56:25

2020A&A...641A..23P - Astronomy and Astrophysics, volume 641A, 23-23 (2020/9-1)

GJ 273: on the formation, dynamical evolution, and habitability of a planetary system hosted by an M dwarf at 3.75 parsec.

POZUELOS F.J., SUAREZ J.C., DE ELIA G.C., BERDINAS Z.M., BONFANTI A., DUGARO A., GILLON M., JEHIN E., GUNTHER M.N., VAN GROOTEL V., GARCIA L.J., THUILLIER A., DELREZ L. and RODON J.R.

Abstract (from CDS):


Context. Planets orbiting low-mass stars such as M dwarfs are now considered a cornerstone in the search for planets with the potential to harbour life. GJ 273 is a planetary system orbiting an M dwarf only 3.75pc away, which is composed of two confirmed planets, GJ 273b and GJ 273c, and two promising candidates, GJ 273d and GJ 273e. Planet GJ 273b resides in the habitable zone. Currently, due to a lack of observed planetary transits, only the minimum masses of the planets are known: Mbsinib=2.89M, Mcsinic=1.18M, Mdsinid=10.80M, and Mesinie=9.30M. Despite its interesting character, the GJ 273 planetary system has been poorly studied thus far.
Aims. We aim to precisely determine the physical parameters of the individual planets, in particular, to break the mass-inclination degeneracy to accurately determine the mass of the planets. Moreover, we present a thorough characterisation of planet GJ 273b in terms of its potential habitability.
Methods. First, we explored the planetary formation and hydration phases of GJ 273 during the first 100Myr. Secondly, we analysed the stability of the system by considering both the two- and four-planet configurations. We then performed a comparative analysis between GJ 273 and the Solar System and we searched for regions in GJ 273 which may harbour minor bodies in stable orbits, that is, the main asteroid belt and Kuiper belt analogues.
Results. From our set of dynamical studies, we find that the four-planet configuration of the system allows us to break the mass-inclination degeneracy. From our modelling results, the masses of the planets are unveiled as: 2.89≤Mb≤3.03M, 1.18≤Mc≤1.24M, 10.80≤Md≤11.35M, and 9.30≤Me≤9.70M. These results point to a system that is likely to be composed of an Earth-mass planet, a super-Earth and two mini-Neptunes. Based on planetary formation models, we determine that GJ 273b is likely an efficient water captor while GJ 273c is probably a dry planet. We find that the system may have several stable regions where minor bodies might reside. Collectively, these results are used to offer a comprehensive discussion about the habitability of GJ 273b.

Abstract Copyright: © ESO 2020

Journal keyword(s): planets and satellites: dynamical evolution and stability - planets and satellites: formation

Simbad objects: 24

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Number of rows : 24

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 TOI-125 PM* 01 34 22.7347423612 -66 40 32.952256757   11.72 11.02     ~ 7 0
2 HD 10180 * 01 37 53.5773715933 -60 30 41.485438420   7.95 7.32     G1V 156 2
3 L 372-58 PM* 03 35 59.6996745075 -44 30 45.725264343 16.22 14.98 13.07 11.45 9.47 M5.5V 81 0
4 L 231-32 PM* 04 33 39.7202257810 -51 57 22.436253190     12.617 12.147   ~ 14 0
5 * bet Pic PM* 05 47 17.0876901 -51 03 59.441135 4.13 4.03 3.86 3.74 3.58 A6V 1679 1
6 BD+05 1668 PM* 07 27 24.49975 +05 13 32.8332 12.558 11.443 9.872 8.699 7.161 M3.5V 346 0
7 GJ 273 e Pl? 07 27 24.49975 +05 13 32.8332           ~ 1 0
8 BD+05 1668b Pl 07 27 24.49975 +05 13 32.8332           ~ 7 0
9 GJ 273 d Pl? 07 27 24.49975 +05 13 32.8332           ~ 2 0
10 BD+05 1668c Pl 07 27 24.49975 +05 13 32.8332           ~ 7 0
11 L 98-59 PM* 08 18 07.6215096918 -68 18 46.799548510   13.22 11.685 11.294   M3V 22 0
12 G 162-44 PM* 10 18 35.1370942089 -11 43 00.241585751   14.68 13.14 12.84   M4.0 17 0
13 * 47 UMa PM* 10 59 27.9738644892 +40 25 48.922388918   5.66   4.7   G1-VFe-0.5 719 1
14 LP 791-18 * 11 02 45.9543871728 -16 24 22.285705785           ~ 4 0
15 Ross 128 Er* 11 47 44.3968668170 +00 48 16.404931305 14.223 12.905 11.153 9.859 8.184 dM4 345 0
16 NAME Proxima Centauri Er* 14 29 42.9451234609 -62 40 46.170818907 14.21 12.95 11.13 9.45 7.41 M5.5Ve 995 0
17 NAME Proxima Centauri b Pl 14 29 42.9451234609 -62 40 46.170818907           ~ 230 0
18 HD 141399 PM* 15 46 53.8135343869 +46 59 10.540785912   7.93 7.20     K0 28 0
19 HD 172555 PM* 18 45 26.9004853 -64 52 16.539796   4.967 4.767     A7V 239 0
20 Kepler-47 EB* 19 41 11.4984891255 +46 55 13.705101341           ~ 127 1
21 TYC 3162-665-1 * 20 06 15.4527143158 +44 27 24.791354432   12.82 12.01 11.75   F3V 95 0
22 * alf PsA ** 22 57 39.04625 -29 37 20.0533 1.31 1.25 1.16 1.11 1.09 A4V 1129 3
23 TRAPPIST-1 LM* 23 06 29.3684052886 -05 02 29.031690445     18.798 16.466 14.024 M7.5e 546 0
24 HD 218396 El* 23 07 28.7156905667 +21 08 03.302133882   6.21 5.953     F0+VkA5mA5 916 0

    Equat.    Gal    SGal    Ecl

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2020.12.05-00:56:25

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