Query : 2013A&A...550A..54D

2013A&A...550A..54D - Astronomy and Astrophysics, volume 550A, 54-54 (2013/2-1)

The GROUSE project. III. Ks-band observations of the thermal emission from WASP-33b.


Abstract (from CDS):

In recent years, day-side emission from about a dozen hot Jupiters has been detected through ground-based secondary eclipse observations in the near-infrared. These near-infrared observations are vital for determining the energy budgets of hot Jupiters, since they probe the planet's spectral energy distribution near its peak. The aim of this work is to measure the Ks-band secondary eclipse depth of WASP-33b, the first planet discovered to transit an A-type star. This planet receives the highest level of irradiation of all transiting planets discovered to date. Furthermore, its host-star shows pulsations and is classified as a low-amplitude δ Scuti. As part of our GROUnd-based Secondary Eclipse (GROUSE) project we have obtained observations of two separate secondary eclipses of WASP-33b in the Ks-band using the LIRIS instrument on the William Herschel Telescope (WHT). The telescope was significantly defocused to avoid saturation of the detector for this bright star (K∼7.5). To increase the stability and the cadence of the observations, they were performed in staring mode. We collected a total of 5100 and 6900 frames for the first and the second night respectively, both with an average cadence of 3.3s. On the second night the eclipse is detected at the 12 -σ level, with a measured eclipse depth of 0.244+0.027–0.020%. This eclipse depth corresponds to a brightness temperature of 3270+115–160K. The measured brightness temperature on the second night is consistent with the expected equilibrium temperature for a planet with a very low albedo and a rapid re-radiation of the absorbed stellar light. For the other night the short out-of-eclipse baseline prevents good corrections for the stellar pulsations and systematic effects, which makes this dataset unreliable for eclipse depth measurements. This demonstrates the need of getting a sufficient out-of-eclipse baseline.

Abstract Copyright:

Journal keyword(s): techniques: photometric - stars: individual: WASP-33 - planets and satellites: atmospheres

VizieR on-line data: <Available at CDS (J/A+A/550/A54): aug2010.dat sep2010.dat>

Simbad objects: 5

goto Full paper

goto View the references in ADS

Number of rows : 5
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 HD 15082 dS* 02 26 51.0582618096 +37 33 01.736482032   8.41 8.14     kA5hA8mF4 184 1
2 HD 15082b Pl 02 26 51.0582746497 +37 33 01.737746137           ~ 320 1
3 NAME G 139-21b Pl 17 15 18.9337265994 +04 57 50.064695682           ~ 686 1
4 TrES-3 Pl 17 52 07.0185036683 +37 32 46.237002085           ~ 223 2
5 NAME BD+37 4734Bb Pl 22 57 46.8443014981 +38 40 30.355384717           ~ 237 1

To bookmark this query, right click on this link: simbad:objects in 2013A&A...550A..54D and select 'bookmark this link' or equivalent in the popup menu


© Université de Strasbourg/CNRS

    • Contact