2016A&A...596A..54D


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.11CEST09:46:55

2016A&A...596A..54D - Astronomy and Astrophysics, volume 596A, 54-54 (2016/12-1)

Terrestrial planets and water delivery around low-mass stars.

DUGARO A., DE ELIA G.C., BRUNINI A. and GUILERA O.M.

Abstract (from CDS):

Context. Theoretical and observational studies suggest that protoplanetary disks with a wide range of masses could be found around low-mass stars.
Aims. We analyze planetary formation processes in systems without gas giants around M3- and M0-type stars of 0.29M and 0.5M, respectively. In particular, we assume disks with masses of 5% and 10% of the mass of the star. Our study focuses on the formation of terrestrial-like planets and water delivery in the habitable zone (HZ).
Methods. First, we use a semi-analytical model to describe the evolution of embryos and planetesimals during the gaseous phase. Then, a N-body code is used to analyze the last giant impact phase after the gas dissipation.
Results. For M3-type stars, five planets with different properties are formed in the HZ. These planets have masses of 0.072M, ∼0.13M (two of them), and 1.03M, and have water contents of 5.9%, 16.7%, 28.6%, and 60.6% by mass, respectively. Then, the fifth planet formed in the HZ is a dry world with 0.138M. For M0-type stars, four planets are produced in the HZ with masses of 0.28M, 0.51M, 0.72M, and 1.42M, and they have water contents of 26.7%, 45.8%, 68%, and 50.5% by mass, respectively.
Conclusions. M3- and M0-type stars represent targets of interest for the search of exoplanets in the HZ. In fact, the Mars-mass planets formed around M3-type stars could maintain habitable conditions in their early histories. Thus, the search for candidates around young M3-type stars could lead to the detection of planets analogous to early Mars. Moreover, Earth-mass planets should also be discovered around M3-type stars and, sub- and super-Earths should be detected around M0-type stars. Such planets are very interesting since they could maintain habitable conditions for very long.

Abstract Copyright: © ESO, 2016

Journal keyword(s): astrobiology - methods: numerical - protoplanetary disks

Simbad objects: 2

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Number of rows : 2

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 GSS 39 Y*O 16 26 45.0321556934 -24 23 07.808781522           M0 142 1
2 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3027 0

    Equat.    Gal    SGal    Ecl

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2020.07.11-09:46:55

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