2007A&A...461.1185L


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.08CET20:52:39

2007A&A...461.1185L - Astronomy and Astrophysics, volume 461, 1185-1193 (2007/1-3)

A diagram to determine the evaporation status of extrasolar planets.

LECAVELIER DES ETANGS A.

Abstract (from CDS):

To describe the evaporation status of extrasolar planets, we consider an energy diagram in which the potential energy of the planets is plotted versus the energy received by the upper atmosphere. Here we present a basic method to estimate these quantities. For the potential energy, we include the modification of the gravity field by the tidal forces from the parent stars. This description allows a rapid estimate of both the escape rate of the atmospheric gas and the lifetime of a planet against the evaporation process. In the energy diagram, we find an evaporation-forbidden region in which a gaseous planet would evaporate in less than 5 billion years. With their observed characteristics, all extrasolar planets are found outside this evaporation-forbidden region. The escape rates are estimated to be in the range 105g/s to 1012g/s, with a few cases above 1011g/s. The estimated escape rate for HD209458b is consistent with the lower limit of 1010g/s obtained from interpretation of the Hi Lyman-α observations. This diagram suggests possibilities for the nature of the recently discovered Neptune-mass planets. We find that GJ436b, 55Cnce and HD69830b cannot be low mass gaseous planets. With a density that must be above 0.5g/cm3 to survive evaporation, these planets must contain a large fraction of solid/liquid material. We find that GJ876d must have a density greater than ∼3g/cm3 to survive the strong EUV energy flux from its nearby parent star. GJ876d must contain a large fraction of massive elements.

Abstract Copyright:

Journal keyword(s): stars: planetary systems

Simbad objects: 25

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Number of rows : 25

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 HD 4308 PM* 00 44 39.2675256910 -65 38 58.282490370 7.31 7.193 6.552     G6VFe-0.9 223 1
2 HD 46375b Pl 06 33 12.6225933827 +05 27 46.527797938           ~ 61 1
3 HD 63454b Pl 07 39 21.8536904513 -78 16 44.307904025           ~ 28 1
4 HD 69830d Pl 08 18 23.9469692487 -12 37 55.810202572           ~ 41 1
5 HD 69830c Pl 08 18 23.9469692487 -12 37 55.810202572           ~ 48 1
6 HD 69830b Pl 08 18 23.9469692487 -12 37 55.810202572           ~ 58 1
7 * rho01 Cnc e Pl 08 52 35.8113282132 +28 19 50.956901366           ~ 430 1
8 NAME OGLE-TR-132b Pl 10 50 34.5945727713 -61 57 26.140283621           ~ 101 1
9 NAME OGLE-TR-113b Pl 10 52 24.2808297652 -61 26 48.845891762           ~ 113 1
10 NAME OGLE-TR-111b Pl 10 53 17.8066842748 -61 24 20.606379347           ~ 109 1
11 Ross 905b Pl 11 42 11.0933874353 +26 42 23.658083337           ~ 637 1
12 BD-07 4003b Pl 15 19 26.8271336166 -07 43 20.190958776           ~ 75 1
13 BD+28 2507b Pl 16 02 11.8463105423 +28 10 10.419642379           ~ 162 1
14 HD 149026b Pl 16 30 29.6184841164 +38 20 50.310893575           ~ 305 1
15 * mu. Ara d Pl 17 44 08.7036342277 -51 50 02.591049123           ~ 57 2
16 OGLE-TR 10 EB* 17 51 28.2589927588 -29 52 35.232998832     15.780 16.193 14.92 G2V 84 1
17 NAME OGLE-TR-10b Pl 17 51 28.2589927588 -29 52 35.232998832           ~ 84 1
18 NAME OGLE-TR-56b Pl 17 56 35.5015759807 -29 32 21.476706712           ~ 195 1
19 NAME V672 Lyr b Pl 19 04 09.8516024106 +36 37 57.445911611           ~ 312 1
20 HD 189733b Pl 20 00 43.7130382888 +22 42 39.071811263           ~ 1153 1
21 HD 190360c Pl 20 03 37.4049065078 +29 53 48.495330996           ~ 44 1
22 HD 209458b Pl 22 03 10.7729598762 +18 53 03.548248479           ~ 1551 1
23 BD-15 6290 BY* 22 53 16.7323107416 -14 15 49.303409936 12.928 11.749 10.192 9.013 7.462 M3.5V 877 1
24 BD-15 6290d Pl 22 53 16.7323107416 -14 15 49.303409936           ~ 137 1
25 * 51 Peg b Pl 22 57 27.9804167474 +20 46 07.782240714           ~ 547 1

    Equat.    Gal    SGal    Ecl

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2021.03.08-20:52:39

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