Query : 2006A&A...450.1221B

2006A&A...450.1221B - Astronomy and Astrophysics, volume 450, 1221-1229 (2006/5-2)

Birth and fate of hot-Neptune planets.


Abstract (from CDS):

This paper presents a consistent description of the formation and the subsequent evolution of gaseous planets, with special attention to short-period, low-mass hot-Neptune planets characteristic of µ Ara-like systems. We show that core accretion, including migration and disk evolution, and subsequent evolution, taking irradiation and evaporation into account, provides a viable formation mechanism for this type of strongly irradiated light planets. At an orbital distance due to the incident XUV stellar flux. In order to reach a µ Ara-like mass (∼14M) after ∼1Gyr, the initial planet mass must range from 166M (∼0.52MJ) to about 20M, for evaporation rates varying by 2 orders of magnitude, which corresponds to 90% to 20% mass loss during evolution. The presence of a core and heavy elements in the envelope affects the structure and the evolution of the planet appreciably and yields ∼8%-9% difference in radius compared to coreless objects of solar composition for Saturn-mass planets. These combinations of evaporation rates and internal compositions translate into different detection probabilities and thus into different statistical distributions for hot-Neptunes and hot-Jupiters. These calculations provide an observable diagnostic, namely a mass-radius-age relationship to distinguish between the present core-accretion-evaporation model and the alternative colliding core scenario for the formation of hot-Neptunes.

Abstract Copyright:

Journal keyword(s): planetary systems: formation - stars: individual: µ Ara

CDS comments: Paragraph 3.1. HD 209548b is a misprint for HD 209458b. OGLE-TR 26b is a probable misprint for OGLE-TR 56b.

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 * mu. Ara PM* 17 44 08.7031414872 -51 50 02.591603160   5.85 5.15     G3IV-V 519 2
2 NAME OGLE-TR-56b Pl 17 56 35.5015759807 -29 32 21.476706712           ~ 201 1
3 HD 209458b Pl 22 03 10.7729598762 +18 53 03.548248479           ~ 1773 1

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