2011A&A...529A..80E


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.15CEST13:57:46

2011A&A...529A..80E - Astronomy and Astrophysics, volume 529A, 80-80 (2011/5-1)

HST/STIS lyman-α observations of the quiet M dwarf GJ 436. Predictions for the exospheric transit signature of the hot Neptune GJ 436b.

EHRENREICH D., LECAVELIER DES ETANGS A. and DELFOSSE X.

Abstract (from CDS):

Lyman-α (Lyα) emission of neutral hydrogen (λ1215.67Å) is the main contributor to the ultraviolet flux of low-mass stars such as M dwarfs. It is also the main light source used in studies of the evaporating upper atmospheres of transiting extrasolar planets with ultraviolet transmission spectroscopy. However, there are very few observations of the Lyα emissions of quiet M dwarfs, and none exist for those hosting exoplanets. Here, we present Lyα observations of the hot-Neptune host star GJ 436 with the Hubble Space Telescope Imaging Spectrograph (HST/STIS). We detect bright emission in the first resolved and high quality spectrum of a quiet M dwarf at Lyα. Using an energy diagram for exoplanets and an N-body particle simulation, this detection enables the possible exospheric signature of the hot Neptune to be estimated as a ∼11% absorption in the Lyα stellar emission, for a typical mass-loss rate of 1010g/s. The atmosphere of the planet GJ 436b is found to be stable to evaporation, and should be readily observable with HST. We also derive a correlation between X-ray and Lyα emissions for M dwarfs. This correlation will be useful for predicting the evaporation signatures of planets transiting other quiet M dwarfs.

Abstract Copyright:

Journal keyword(s): ultraviolet: planetary systems - planets and satellites: individual: GJ 436b - planets and satellites: atmospheres - stars: low-mass - stars: activity - techniques: spectroscopic

Simbad objects: 21

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Number of rows : 21

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 4345 * 00 43 21.2075706544 -80 19 59.686717205   10.719 9.27     K2 4 0
2 Ross 42 Er* 05 32 14.6562729108 +09 49 14.930460435 14.226 13.158 11.529 10.37 8.868 M4Ve 121 1
3 WASP-12 ** 06 30 32.7966788910 +29 40 20.266334158   12.14 11.57     G0V 229 2
4 V* YY Gem BY* 07 34 37.4475372002 +31 52 10.181030942 11.60 10.56 9.27 7.69 6.67 M0.5VeFe-2 818 0
5 V* YZ CMi Er* 07 44 40.1726285952 +03 33 08.877830321 13.761 12.831 11.225 9.958 8.263 M4.0Ve 782 0
6 BD+20 2465 Er* 10 19 36.2808024653 +19 52 12.014037746   10.82 9.52 9.19   M4Vae 1152 0
7 HD 95735 Fl* 11 03 20.19400 +35 58 11.5682 10.030 8.960 7.520 5.99 4.79 M2+V 625 1
8 Ross 905b Pl 11 42 11.0933874353 +26 42 23.658083337           ~ 598 1
9 Ross 905 PM* 11 42 11.0933874353 +26 42 23.658083337   12.06 10.613 10.272 8.24 M3V 498 1
10 BD+13 2618 Er* 13 00 46.5602816848 +12 22 32.716799085 12.314 11.233 9.750 8.785 7.653 M0V 303 1
11 V* V645 Cen Er* 14 29 42.9451234609 -62 40 46.170818907 14.21 12.95 11.13 9.45 7.41 M5.5Ve 966 0
12 NAME G 139-21b Pl 17 15 18.9337265994 +04 57 50.064695682           ~ 539 1
13 Ross 154 Er* 18 49 49.3638007809 -23 50 10.453568573 13.528 12.19 10.43 10.23 7.703 M3.5Ve 323 0
14 HD 189733b Pl 20 00 43.7130382888 +22 42 39.071811263           ~ 1088 1
15 V* AU Mic BY* 20 45 09.5323695486 -31 20 27.241710746   10.05 8.627 9.078 6.593 M1VeBa1 898 0
16 V* AX Mic Er* 21 17 15.2688576495 -38 52 02.510022611   8.09 6.68     M1V 203 0
17 HD 209458 V* 22 03 10.7729598762 +18 53 03.548248479   8.21 7.63     F9V 994 1
18 HD 209458b Pl 22 03 10.7729598762 +18 53 03.548248479           ~ 1480 1
19 V* EV Lac Er* 22 46 49.7311740821 +44 20 02.372223230   11.85 10.26 9.89   M4.0V 802 2
20 HD 217987 PM* 23 05 52.0354545522 -35 51 11.058757520   8.82 7.34     M2V 218 0
21 NAME Local Bubble ISM ~ ~           ~ 695 0

    Equat.    Gal    SGal    Ecl

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2020.08.15-13:57:46

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