2019A&A...624A..62M


Query : 2019A&A...624A..62M

2019A&A...624A..62M - Astronomy and Astrophysics, volume 624A, 62-62 (2019/4-1)

Low albedos of hot to ultra-hot Jupiters in the optical to near-infrared transition regime.

MALLONN M., KOHLER J., ALEXOUDI X., VON ESSEN C., GRANZER T., POPPENHAEGER K. and STRASSMEIER K.G.

Abstract (from CDS):

The depth of a secondary eclipse contains information of both the thermally emitted light component of a hot Jupiter and the reflected light component. If the day side atmosphere of the planet is assumed to be isothermal, it is possible to disentangle both. In this work, we analyzed 11 eclipse light curves of the hot Jupiter HAT-P-32 b obtained at 0.89 µm in the z' band. We obtained a null detection for the eclipse depth with state-of-the-art precision, -0.01±0.10ppt. We confirm previous studies showing that a non-inverted atmosphere model is in disagreement to the measured emission spectrum of HAT-P-32 b. We derive an upper limit on the reflected light component, and thus, on the planetary geometric albedo Ag. The 97.5% confidence upper limit is Ag<0.2. This is the first albedo constraint for HAT-P-32 b, and the first z' band albedo value for any exoplanet. This finding disfavors the influence of large-sized silicate condensates on the planetary day side. We inferred z' band geometric albedo limits from published eclipse measurements also for the ultra-hot Jupiters WASP-12 b, WASP-19 b, WASP-103 b, and WASP-121 b, applying the same method. These values consistently point to a low reflectivity in the optical to near-infrared transition regime for hot to ultra-hot Jupiters.

Abstract Copyright: © ESO 2019

Journal keyword(s): methods: observational - techniques: photometric - planets and satellites: fundamental parameters

VizieR on-line data: <Available at CDS (J/A+A/624/A62): h32ecl-z.dat>

Simbad objects: 16

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Number of rows : 16
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 HD 10069b Pl 01 37 25.0335097438 -45 40 40.376513381           ~ 295 1
2 HAT-P-32 * 02 04 10.2774374568 +46 41 16.212315084   11.79 11.44 11.23   ~ 56 1
3 HAT-P-32b Pl 02 04 10.2775457769 +46 41 16.210382751           ~ 112 1
4 HD 15082b Pl 02 26 51.0582746497 +37 33 01.737746137           ~ 270 1
5 WASP-12b Pl 06 30 32.7966788910 +29 40 20.266334158           G0 660 1
6 CoRoT-1b Pl 06 48 19.1724141241 -03 06 07.710423478           ~ 162 1
7 CD-38 3220b Pl 07 10 24.0606039387 -39 05 50.570553937           ~ 207 0
8 WASP-19b Pl 09 53 40.0764883458 -45 39 33.055979403           ~ 314 1
9 WASP-43b Pl 10 19 38.0089444408 -09 48 22.603103969           ~ 279 1
10 HATS-18b Pl 11 35 49.7771099628 -29 09 21.753959414           ~ 26 0
11 WASP-103b Pl 16 37 15.5753608801 +07 11 00.119024745           ~ 136 1
12 HATS-24b Pl 17 55 33.7673969403 -61 44 50.367385396           ~ 12 0
13 Kepler-7b Pl 19 14 19.5623271934 +41 05 23.365460942           ~ 182 1
14 HD 189733b Pl 20 00 43.7130382888 +22 42 39.071811263           ~ 1253 1
15 KELT-16b Pl 20 57 04.4386615783 +31 39 39.629670391           ~ 31 0
16 WASP-4b Pl 23 34 15.0857248317 -42 03 41.047972591           ~ 143 1

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2022.05.28-23:08:17

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