Query : 2022A&A...664A..47K

2022A&A...664A..47K - Astronomy and Astrophysics, volume 664A, 47-47 (2022/8-1)

Near-infrared and optical emission of WASP-5 b.


Abstract (from CDS):

Context. Thermal emission from extrasolar planets makes it possible to study important physical processes in their atmospheres and derive more precise orbital elements.
Aims. By using new near-infrared (NIR) and optical data, we examine how these data constrain the orbital eccentricity and the thermal properties of the planet atmosphere.
Methods. The full light curves acquired by the TESS satellite from two sectors are used to put an upper limit on the amplitude of the phase variation of the planet and estimate the occultation depth. Two previously published observations and one followup observation (published herein) in the 2MASS K (Ks) band are employed to derive a more precise occultation light curve in this NIR waveband.
Results. The merged occultation light curve in the Ks band comprises 4515 data points. The data confirm the results of the earlier eccentricity estimates, suggesting a circular orbit of: e = 0.005 ± 0.015. The high value of the flux depression of (2.70 ± 0.14) ppt in the Ks band excludes simple black body emission at the 10σ level and also disagrees with current atmospheric models at the (4-7)σ level. From analysis of the TESS data, in the visual band we find tentative evidence for a near-noise-level detection of the secondary eclipse, and place constraints on the associated amplitude of the phase variation of the planet. A formal box fit yields an occultation depth of (0.157 ± 0.056) ppt. This implies a relatively high geometric albedo of Ag = 0.43 ± 0.15 for fully efficient atmospheric circulation and Ag = 0.29 ± 0.15 for no circulation at all. No preference can be seen for either the oxygen-enhanced or the carbon-enhanced atmosphere models.

Abstract Copyright: © G. Kovacs et al. 2022

Journal keyword(s): planets and satellites: gaseous planets - planets and satellites: atmospheres - planets and satellites: detection

VizieR on-line data: <Available at CDS (J/A+A/664/A47): c1s1_cds.dat c1s2_cds.dat c1s3_cds.dat c1s4_cds.dat ks_mf.dat ks_mfb.dat>

Simbad objects: 5

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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 - 2024
1 WASP-5b Pl 23 57 23.7564672192 -41 16 37.743700800           ~ 97 1
2 WASP-5 EB* 23 57 23.7564672192 -41 16 37.743700800   12.808 12.146 12.058 11.44 G4V 119 1
3 2MASS J23574374-4112338 IR 23 57 43.74840 -41 12 33.8256           ~ 1 0
4 TYC 8018-100-1 * 23 57 44.4806587152 -41 13 20.351030952   12.565 11.948     ~ 5 0
5 UCAC4 244-187319 ** 23 57 48.657408 -41 12 57.49632   13.578 12.843 12.724 11.96 ~ 4 0

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