2006A&A...455L..25A


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.16CET10:55:42

2006A&A...455L..25A - Astronomy and Astrophysics, volume 455, L25-28 (2006/8-4)

Formation and structure of the three Neptune-mass planets system around HD69830.

ALIBERT Y., BARAFFE I., BENZ W., CHABRIER G., MORDASINI C., LOVIS C., MAYOR M., PEPE F., BOUCHY F., QUELOZ D. and UDRY S.

Abstract (from CDS):

Since the discovery of the first giant planet outside the solar system in 1995 (Mayor & Queloz, 1995Natur.378..355M), more than 180 extrasolar planets have been discovered. With improving detection capabilities, a new class of planets with masses 5-20 times larger than the Earth, at close distance from their parent star is rapidly emerging. Recently, the first system of three Neptune-mass planets has been discovered around the solar type star HD69830 (Lovis et al., 2006Natur.441..305L). Here, we present and discuss a possible formation scenario for this planetary system based on a consistent coupling between the extended core accretion model and evolutionary models (Alibert et al., 2005A&A...434..343A; Baraffe et al., 2004A&A...419L..13B; Baraffe et al., 2006A&A...450.1221B). We show that the innermost planet formed from an embryo having started inside the iceline is composed essentially of a rocky core surrounded by a tiny gaseous envelope. The two outermost planets started their formation beyond the iceline and, as a consequence, accrete a substantial amount of water ice during their formation. We calculate the present day thermodynamical conditions inside these two latter planets and show that they are made of a rocky core surrounded by a shell of fluid water and a gaseous envelope.

Abstract Copyright:

Journal keyword(s): stars: planetary systems - stars: planetary systems: formation

Simbad objects: 5

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Number of rows : 5

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 HD 69830 PM* 08 18 23.9469692487 -12 37 55.810202572   6.74 5.95     G8:V 456 2
2 HD 69830c Pl 08 18 23.94706 -12 37 55.8116           ~ 46 1
3 HD 69830b Pl 08 18 23.94706 -12 37 55.8116           ~ 56 1
4 HD 69830d Pl 08 18 23.94706 -12 37 55.8116           ~ 40 1
5 HD 149026 PM* 16 30 29.6184841164 +38 20 50.310893575   8.75 8.14     G0IV 193 1

    Equat.    Gal    SGal    Ecl

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2019.12.16-10:55:42

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