2020A&A...641A.161Z


Query : 2020A&A...641A.161Z

2020A&A...641A.161Z - Astronomy and Astrophysics, volume 641A, 161-161 (2020/9-1)

Search for He I airglow emission from the hot Jupiter τ Boo b.

ZHANG Y., SNELLEN I.A.G., MOLLIERE P., ALONSO-FLORIANO F.J., WEBB R.K., BROGI M. and WYTTENBACH A.

Abstract (from CDS):


Context.It has been suggested that the helium absorption line at 10830Å that originates from the metastable triplet state 23S is an excellent probe for the extended atmospheres of hot Jupiters and their hydrodynamic escape processes.It has recently been detected in the transmission spectra of a handful of planets. The isotropic reemission will lead to helium airglow that may be observable at other orbital phases.
Aims. We investigate the detectability of HeI emission at 10830Å in the atmospheres of exoplanets using high-resolution spectroscopy. This would provide insights into the properties of the upper atmospheres of close-in gas giants.
Methods. We estimated the expected strength of HeI emission in hot Jupiters based on their transmission signal. We searched for the HeI 10 830 Å emission feature in τ Boo b in three nights of high-resolution spectra taken by CARMENES at the 3.5m Calar Alto telescope. The spectra from each night were corrected for telluric absorption, sky emission lines, and stellar features, and were shifted to the planetary rest frame to search for the emission.
Results. The HeI emission is not detected in τ Boo b at a 5σ contrast limit of 4x10–4 for emission line widths of >20km/s. This is about a factor 8 above the expected emission level (assuming a typical HeI transit absorption of 1% for hot Jupiters). This suggests that targeting the HeI emission with well-designed observations using upcoming instruments such as VLT/CRIRES+ and E-ELT/HIRES is possible.

Abstract Copyright: © ESO 2020

Journal keyword(s): planets and satellites: atmospheres - planets and satellites: individual: tau Boo b - techniques: spectroscopic - infrared: planetary systems

Simbad objects: 14

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Number of rows : 14
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 WASP-12b Pl 06 30 32.7966788910 +29 40 20.266334158           G0 606 1
2 NAME LP 424-4b Pl 07 59 05.8395618539 +15 23 29.240025256           ~ 204 1
3 K2-100b Pl 08 38 24.3004849747 +20 06 21.828303951           ~ 32 0
4 Ross 905b Pl 11 42 11.0933874353 +26 42 23.658083337           ~ 663 1
5 K2-235b Pl 12 33 32.8440958980 -10 08 46.223886777           ~ 79 0
6 * tau Boo b Pl 13 47 15.74340 +17 27 24.8552           ~ 248 1
7 * tau Boo Ro* 13 47 15.74340 +17 27 24.8552 5.02 4.98 4.49 4.09 3.85 F7IV-V 915 1
8 NAME G 139-21b Pl 17 15 18.9337265994 +04 57 50.064695682           ~ 587 1
9 BD+47 2936b Pl 19 50 50.2474562793 +48 04 51.097364378           ~ 330 1
10 HD 189733b Pl 20 00 43.7130382888 +22 42 39.071811263           ~ 1191 1
11 HD 195689b Pl 20 31 26.3534038246 +39 56 19.765154336           ~ 138 0
12 NAME AU Mic b Pl? 20 45 09.5323695486 -31 20 27.241710746           ~ 22 0
13 BD-05 5432b Pl 21 00 06.1969250596 -05 05 40.037007561           ~ 68 1
14 HD 209458b Pl 22 03 10.7729598762 +18 53 03.548248479           ~ 1597 1

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2021.10.20-21:15:17

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