2021A&A...646A.159S

Query : 2021A&A...646A.159S

2021A&A...646A.159S - Astronomy and Astrophysics, volume 646A, 159-159 (2021/2-1)

The GAPS Programme at TNG. XXIX. No detection of reflected light from 51 Peg b using optical high-resolution spectroscopy.

SCANDARIATO G., BORSA F., SICILIA D., MALAVOLTA L., BIAZZO K., BONOMO A.S., BRUNO G., CLAUDI R., COVINO E., DI MARCANTONIO P., ESPOSITO M., FRUSTAGLI G., LANZA A.F., MALDONADO J., MAGGIO A., MANCINI L., MICELA G., NARDIELLO D., RAINER M., SINGH V., SOZZETTI A., AFFER L., BENATTI S., BIGNAMINI A., BILIOTTI V., CAPUZZO-DOLCETTA R., CARLEO I., COSENTINO R., DAMASSO M., DESIDERA S., GARCIA DE GURTUBAI A., GHEDINA A., GIACOBBE P., GIANI E., HARUTYUNYAN A., HERNANDEZ N., HERNANDEZ DIAZ M., KNAPIC C., LETO G., MARTINEZ FIORENZANO A.F., MOLINARI E., NASCIMBENI V., PAGANO I., PEDANI M., PIOTTO G., PORETTI E. and STOEV H.

Abstract (from CDS):


Context. The analysis of exoplanetary atmospheres by means of high-resolution spectroscopy is an expanding research field which provides information on the chemical composition, thermal structure, atmospheric dynamics, and orbital velocity of exoplanets.
Aims. In this work, we aim to detect the light reflected by the exoplanet 51 Peg b by employing optical high-resolution spectroscopy.
Methods. To detect the light reflected by the planetary dayside, we used optical High Accuracy Radial velocity Planet Searcher and High Accuracy Radial velocity Planet Searcher for the Northern hemisphere spectra taken near the superior conjunction of the planet, when the flux contrast between the planet and the star is maximum. To search for the weak planetary signal, we cross-correlated the observed spectra with a high signal-to-noise ratio stellar spectrum.
Results. We homogeneously analyze the available datasets and derive a 10–5 upper limit on the planet-to-star flux contrast in the optical.
Conclusions. The upper limit on the planet-to-star flux contrast of 10–5 translates into a low albedo of the planetary atmosphere (Ag≤0.05-0.15 for an assumed planetary radius in the range of 1.5-0.9RJup, as estimated from the planet's mass).

Abstract Copyright: © ESO 2021

Journal keyword(s): techniques: spectroscopic - planets and satellites: atmospheres - planets and satellites: detection - planets and satellites: gaseous planets - planets and satellites: individual: 51 Peg b

VizieR on-line data: <Available at CDS (J/A+A/646/A159): table1.dat>

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 Kepler-51b Pl 19 45 55.1428629456 +49 56 15.650520684           ~ 94 1
2 Kepler-51c Pl 19 45 55.1428629456 +49 56 15.650520684           ~ 51 1
3 HAT-P-65b Pl 21 03 37.3130781288 +11 59 21.819803748           ~ 23 0
4 * 51 Peg PM* 22 57 27.9804852576 +20 46 07.797040104 6.39 6.16 5.46 4.97 4.61 G2IV 1159 1
5 * 51 Peg b Pl 22 57 27.9804852576 +20 46 07.797040104           ~ 666 1

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