2015ApJ...815..118F


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.05CET18:36:02

2015ApJ...815..118F - Astrophys. J., 815, 118 (2015/December-3)

Far-UV spectroscopy of the planet-hosting star WASP-13: high-energy irradiance, distance, age, planetary mass-loss rate, and circumstellar environment.

FOSSATI L., FRANCE K., KOSKINEN T., JUVAN I.G., HASWELL C.A. and LENDL M.

Abstract (from CDS):

Several transiting hot Jupiters orbit relatively inactive main-sequence stars. For some of those, the activity parameter lies below the basal level (-5.1). Two explanations have been proposed so far: (i) the planet affects the stellar dynamo, (ii) the measurements are biased by extrinsic absorption, either by the interstellar medium (ISM) or by material local to the system. We present here Hubble Space Telescope/COS far-UV spectra of WASP-13, which hosts an inflated hot Jupiter and has a measured value (-5.26), well below the basal level. From the star's spectral energy distribution we obtain an extinction = 0.045±0.025 mag and a distance d = 232±8 pc. We detect at ≳4σ lines belonging to three different ionization states of carbon (C i, C ii, and C iv) and the Si iv doublet at ∼3σ. Using far-UV spectra of nearby early G-type stars of known age, we derive a C iv/C i flux ratio-age relation, from which we estimate WASP-13's age to be 5.1±2.0 Gyr. We rescale the solar irradiance reference spectrum to match the flux of the C iv 1548 doublet. By integrating the rescaled solar spectrum, we obtain an XUV flux at 1 AU of 5.4 erg/s/cm2. We use a detailed model of the planet's upper atmosphere, deriving a mass-loss rate of 1.5x1011 g/s. Despite the low value, the star shows a far-UV spectrum typical of middle-aged solar-type stars, pointing toward the presence of significant extrinsic absorption. The analysis of a high-resolution spectrum of the Ca ii H&K lines indicates that the ISM absorption could be the origin of the low value. Nevertheless, the large uncertainty in the Ca ii ISM abundance does not allow us to firmly exclude the presence of circumstellar gas.

Abstract Copyright:

Journal keyword(s): ISM: abundances - planets and satellites: individual: WASP-13b - stars: activity - stars: individual: WASP-13 - ultraviolet: stars

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 - 2021
#notes
1 HD 10069 * 01 37 25.0335097438 -45 40 40.376513381   9.74 9.30     F6IV/V 165 1
2 HD 10069b Pl 01 37 25.0335097438 -45 40 40.376513381           ~ 246 1
3 * kap01 Cet BY* 03 19 21.6963205 +03 22 12.715139 5.71 5.52 4.85 4.27 3.91 G5V 831 0
4 V* V1038 Tau BY* 03 44 20.0899109759 +24 47 46.204314184   11.2 10.4 10.3   G1-2V 111 0
5 * zet Dor PM* 05 05 30.6561782324 -57 28 21.728931803   5.215 4.708     F9VFe-0.5 221 0
6 * chi01 Ori RS* 05 54 22.9829893 +20 16 34.222038 5.08 5.00 4.40 3.90 3.59 G0V 808 0
7 WASP-12 ** 06 30 32.7966788910 +29 40 20.266334158   12.14 11.57     G0V 241 2
8 WASP-12b Pl 06 30 32.7966788910 +29 40 20.266334158           G0 587 1
9 HD 59967 PM* 07 30 42.5117283582 -37 20 21.704201159 7.386 7.274 6.635 6.28 5.945 G3V 134 0
10 BD+34 1976b Pl 09 20 24.7143829845 +33 52 56.699778302           ~ 49 1
11 BD+34 1976 V* 09 20 24.7143829845 +33 52 56.699778302   11.21 10.42     G1V 58 1
12 HD 97334 BY* 11 12 32.3505448605 +35 48 50.691547084   7.02   6.0   G2 261 0
13 HD 106516 SB* 12 15 10.55731 -10 18 44.6354 6.44 6.57 6.11     F9VFe-1.7CH-0.7 392 0
14 V* EK Dra BY* 14 39 00.2109485496 +64 17 29.977371998   8.243 7.604     G1.5V 386 0
15 * alf Cen A SB* 14 39 36.49400 -60 50 02.3737 0.96 0.72 0.01     G2V 1157 0
16 * chi Her PM* 15 52 40.5411372117 +42 27 05.451105113 5.19 5.19 4.62 4.14 3.82 F8VFe-2Hdel-1 483 0
17 HD 165185 PM* 18 06 23.7191233830 -36 01 11.229463639 6.64 6.57 5.95 5.58   G1V 151 0
18 HD 189733b Pl 20 00 43.7130382888 +22 42 39.071811263           ~ 1153 1
19 HD 199288 PM* 20 57 40.0679487434 -44 07 45.739637893   7.11 6.52     G2VFe-1.0 175 0
20 HD 209458b Pl 22 03 10.7729598762 +18 53 03.548248479           ~ 1550 1
21 HD 209458 V* 22 03 10.7729598762 +18 53 03.548248479   8.21 7.63     F9V 1009 1

    Equat.    Gal    SGal    Ecl

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