| Records |
| Author |
Cont, D.; Yan, F.; Reiners, A.; Nortmann, L.; Molaverdikhani, K.; Palle, E.; Stangret, M.; Henning, T.; Ribas, I.; Quirrenbach, A.; Caballero, J.A.; Osorio, M.R.Z.; Amado, P.J.; Aceituno, J.; Casasayas-Barris, N.; Czesla, S.; Kaminski, A.; Lopez-Puertas, M.; Montes, D.; Morales, J.C.; Morello, G.; Nagel, E.; Sanchez-Lopez, A.; Sedaghati, E.; Zechmeister, M. |
| Title |
Silicon in the dayside atmospheres of two ultra-hot Jupiters |
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| Year |
2022 |
Publication |
Astronomy & Astrophysics |
Abbreviated Journal |
Astron. Astrophys. |
| Volume |
657 |
Issue |
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Pages |
L2 |
| Keywords |
planets and satellites: atmospheres; techniques: spectroscopic; planets and satellites: individual: WASP-33b; planets and satellites: individual: KELT-20b/MASCARA-2b |
| Abstract |
Atmospheres of highly irradiated gas giant planets host a large variety of atomic and ionic species. Here we observe the thermal emission spectra of the two ultra-hot Jupiters WASP-33b and KELT-20b /MASCARA-2b in the near-infrared wavelength range with CARMENES. Via high-resolution Doppler spectroscopy, we searched for neutral silicon (Si) in their dayside atmospheres. We detect the Si spectral signature of both planets via cross-correlation with model spectra. Detection levels of 4.8 sigma and 5.4 sigma, respectively, are observed when assuming a solar atmospheric composition. This is the first detection of Si in exoplanet atmospheres. The presence of Si is an important finding due to its fundamental role in cloud formation and, hence, for the planetary energy balance. Since the spectral lines are detected in emission, our results also confirm the presence of an inverted temperature profile in the dayside atmospheres of both planets. |
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| ISSN |
0004-6361 |
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| Notes |
WOS:000740006300008 |
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| Call Number |
UAI @ alexi.delcanto @ |
Serial |
1535 |
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| Author |
Sedaghati, E.; MacDonald, R.J.; Casasayas-Barris, N.; Hoeijmakers, H.J.; Boffin, H.M.J.; Rodler, F.; Brahm, R.; Jones, M.; Sanchez-Lopez, A.; Carleo, I.; Figueira, P.; Mehner, A.; Lopez-Puertas, M. |
| Title |
A spectral survey of WASP-19b with ESPRESSO |
Type |
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| Year |
2021 |
Publication |
Monthly Notices Of The Royal Astronomical Society |
Abbreviated Journal |
Mon. Not. Roy. Astron. Soc. |
| Volume |
505 |
Issue |
1 |
Pages |
435-458 |
| Keywords |
methods: data analysis; techniques: spectroscopic; planets and satellites: atmospheres; planets and satellites: individual: WASP-19b; stars: activity; stars: individual: WASP-19 |
| Abstract |
High-resolution precision spectroscopy provides a multitude of robust techniques for probing exoplanetary atmospheres. We present multiple VLT/ESPRESSO transit observations of the hot-Jupiter exoplanet WASP-19b with previously published but disputed atmospheric features from low resolution studies. Through spectral synthesis and modelling of the Rossiter-McLaughlin (RM) effect we calculate stellar, orbital and physical parameters for the system. From narrow-band spectroscopy we do not detect any of Hi, Fei, Mgi, Cai, Nai, and Ki neutral species, placing upper limits on their line contrasts. Through cross-correlation analyses with atmospheric models, we do not detect Fei and place a 3 sigma upper limit of on its mass fraction, from injection and retrieval. We show the inability to detect the presence of H2O for known abundances, owing to lack of strong absorption bands, as well as relatively low S/N ratio. We detect a barely significant peak (3.02 +/- 0.15 sigma) in the cross-correlation map for TiO, consistent with the sub-solar abundance previously reported. This is merely a hint for the presence of TiO and does not constitute a confirmation. However, we do confirm the presence of previously observed enhanced scattering towards blue wavelengths, through chromatic RM measurements, pointing to a hazy atmosphere. We finally present a reanalysis of low-resolution transmission spectra of this exoplanet, concluding that unocculted starspots alone cannot explain previously detected features. Our reanalysis of the FORS2 spectra of WASP-19b finds a similar to 100x sub-solar TiO abundance, precisely constrained to , consistent with the TiO hint from ESPRESSO. We present plausible paths to reconciliation with other seemingly contradicting results. |
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| ISSN |
0035-8711 |
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| Notes |
WOS:000671453100031 |
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| Call Number |
UAI @ alexi.delcanto @ |
Serial |
1438 |
| Permanent link to this record |
