Broad-band spectrophotometry of the hot Jupiter HAT-P-12b from the near-UV to the near-IR

M. Mallonn, V. Nascimbeni, J. Weingrill, C. Von Essen, K. G. Strassmeier, G. Piotto, I. Pagano, G. Scandariato, Sz Csizmadia, E. Herrero, P. V. Sada, V. S. Dhillon, T. R. Marsh, A. Künstler, I. Bernt, T. Granzer

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

© ESO, 2015. Context. The detection of trends or gradients in the transmission spectrum of extrasolar planets is possible with observations at very low spectral resolution. Transit measurements of sufficient accuracy using selected broad-band filters allow for an initial characterization of the atmosphere of the planet. Aims. We want to investigate the atmosphere of the hot Jupiter HAT-P-12b for an increased absorption at the very blue wavelength regions caused by scattering. Furthermore, we aim for a refinement of the transit parameters and the orbital ephemeris. Methods. We obtained time series photometry of 20 transit events and analyzed them homogeneously, along with eight light curves obtained from the literature. In total, the light curves span a range from 0.35 to 1.25 microns. During two observing seasons over four months each, we monitored the host star to constrain the potential influence of starspots on the derived transit parameters. Results. We rule out the presence of a Rayleigh slope extending over the entire optical wavelength range, a flat spectrum is favored for HAT-P-12b with respect to a cloud-free atmosphere model spectrum. A potential cause of such gray absorption is the presence of a cloud layer at the probed latitudes. Furthermore, in this work we refine the transit parameters, the ephemeris and perform a TTV analysis in which we found no indication for an unseen companion. The host star showed a mild non-periodic variability of up to 1%. However, no stellar rotation period could be detected to high confidence.
Original languageEnglish
JournalAstronomy and Astrophysics
DOIs
Publication statusPublished - 1 Nov 2015
Externally publishedYes

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spectrophotometry
transit
Jupiter (planet)
Jupiter
broadband
atmosphere
planet
wavelength
light curve
spectral resolution
starspots
free atmosphere
stellar rotation
atmospheres
stars
scattering
time series
filter
extrasolar planets
European Southern Observatory

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Mallonn, M., Nascimbeni, V., Weingrill, J., Von Essen, C., Strassmeier, K. G., Piotto, G., ... Granzer, T. (2015). Broad-band spectrophotometry of the hot Jupiter HAT-P-12b from the near-UV to the near-IR. Astronomy and Astrophysics. https://doi.org/10.1051/0004-6361/201425395
Mallonn, M. ; Nascimbeni, V. ; Weingrill, J. ; Von Essen, C. ; Strassmeier, K. G. ; Piotto, G. ; Pagano, I. ; Scandariato, G. ; Csizmadia, Sz ; Herrero, E. ; Sada, P. V. ; Dhillon, V. S. ; Marsh, T. R. ; Künstler, A. ; Bernt, I. ; Granzer, T. / Broad-band spectrophotometry of the hot Jupiter HAT-P-12b from the near-UV to the near-IR. In: Astronomy and Astrophysics. 2015.
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abstract = "{\circledC} ESO, 2015. Context. The detection of trends or gradients in the transmission spectrum of extrasolar planets is possible with observations at very low spectral resolution. Transit measurements of sufficient accuracy using selected broad-band filters allow for an initial characterization of the atmosphere of the planet. Aims. We want to investigate the atmosphere of the hot Jupiter HAT-P-12b for an increased absorption at the very blue wavelength regions caused by scattering. Furthermore, we aim for a refinement of the transit parameters and the orbital ephemeris. Methods. We obtained time series photometry of 20 transit events and analyzed them homogeneously, along with eight light curves obtained from the literature. In total, the light curves span a range from 0.35 to 1.25 microns. During two observing seasons over four months each, we monitored the host star to constrain the potential influence of starspots on the derived transit parameters. Results. We rule out the presence of a Rayleigh slope extending over the entire optical wavelength range, a flat spectrum is favored for HAT-P-12b with respect to a cloud-free atmosphere model spectrum. A potential cause of such gray absorption is the presence of a cloud layer at the probed latitudes. Furthermore, in this work we refine the transit parameters, the ephemeris and perform a TTV analysis in which we found no indication for an unseen companion. The host star showed a mild non-periodic variability of up to 1{\%}. However, no stellar rotation period could be detected to high confidence.",
author = "M. Mallonn and V. Nascimbeni and J. Weingrill and {Von Essen}, C. and Strassmeier, {K. G.} and G. Piotto and I. Pagano and G. Scandariato and Sz Csizmadia and E. Herrero and Sada, {P. V.} and Dhillon, {V. S.} and Marsh, {T. R.} and A. K{\"u}nstler and I. Bernt and T. Granzer",
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Mallonn, M, Nascimbeni, V, Weingrill, J, Von Essen, C, Strassmeier, KG, Piotto, G, Pagano, I, Scandariato, G, Csizmadia, S, Herrero, E, Sada, PV, Dhillon, VS, Marsh, TR, Künstler, A, Bernt, I & Granzer, T 2015, 'Broad-band spectrophotometry of the hot Jupiter HAT-P-12b from the near-UV to the near-IR', Astronomy and Astrophysics. https://doi.org/10.1051/0004-6361/201425395

Broad-band spectrophotometry of the hot Jupiter HAT-P-12b from the near-UV to the near-IR. / Mallonn, M.; Nascimbeni, V.; Weingrill, J.; Von Essen, C.; Strassmeier, K. G.; Piotto, G.; Pagano, I.; Scandariato, G.; Csizmadia, Sz; Herrero, E.; Sada, P. V.; Dhillon, V. S.; Marsh, T. R.; Künstler, A.; Bernt, I.; Granzer, T.

In: Astronomy and Astrophysics, 01.11.2015.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Broad-band spectrophotometry of the hot Jupiter HAT-P-12b from the near-UV to the near-IR

AU - Mallonn, M.

AU - Nascimbeni, V.

AU - Weingrill, J.

AU - Von Essen, C.

AU - Strassmeier, K. G.

AU - Piotto, G.

AU - Pagano, I.

AU - Scandariato, G.

AU - Csizmadia, Sz

AU - Herrero, E.

AU - Sada, P. V.

AU - Dhillon, V. S.

AU - Marsh, T. R.

AU - Künstler, A.

AU - Bernt, I.

AU - Granzer, T.

PY - 2015/11/1

Y1 - 2015/11/1

N2 - © ESO, 2015. Context. The detection of trends or gradients in the transmission spectrum of extrasolar planets is possible with observations at very low spectral resolution. Transit measurements of sufficient accuracy using selected broad-band filters allow for an initial characterization of the atmosphere of the planet. Aims. We want to investigate the atmosphere of the hot Jupiter HAT-P-12b for an increased absorption at the very blue wavelength regions caused by scattering. Furthermore, we aim for a refinement of the transit parameters and the orbital ephemeris. Methods. We obtained time series photometry of 20 transit events and analyzed them homogeneously, along with eight light curves obtained from the literature. In total, the light curves span a range from 0.35 to 1.25 microns. During two observing seasons over four months each, we monitored the host star to constrain the potential influence of starspots on the derived transit parameters. Results. We rule out the presence of a Rayleigh slope extending over the entire optical wavelength range, a flat spectrum is favored for HAT-P-12b with respect to a cloud-free atmosphere model spectrum. A potential cause of such gray absorption is the presence of a cloud layer at the probed latitudes. Furthermore, in this work we refine the transit parameters, the ephemeris and perform a TTV analysis in which we found no indication for an unseen companion. The host star showed a mild non-periodic variability of up to 1%. However, no stellar rotation period could be detected to high confidence.

AB - © ESO, 2015. Context. The detection of trends or gradients in the transmission spectrum of extrasolar planets is possible with observations at very low spectral resolution. Transit measurements of sufficient accuracy using selected broad-band filters allow for an initial characterization of the atmosphere of the planet. Aims. We want to investigate the atmosphere of the hot Jupiter HAT-P-12b for an increased absorption at the very blue wavelength regions caused by scattering. Furthermore, we aim for a refinement of the transit parameters and the orbital ephemeris. Methods. We obtained time series photometry of 20 transit events and analyzed them homogeneously, along with eight light curves obtained from the literature. In total, the light curves span a range from 0.35 to 1.25 microns. During two observing seasons over four months each, we monitored the host star to constrain the potential influence of starspots on the derived transit parameters. Results. We rule out the presence of a Rayleigh slope extending over the entire optical wavelength range, a flat spectrum is favored for HAT-P-12b with respect to a cloud-free atmosphere model spectrum. A potential cause of such gray absorption is the presence of a cloud layer at the probed latitudes. Furthermore, in this work we refine the transit parameters, the ephemeris and perform a TTV analysis in which we found no indication for an unseen companion. The host star showed a mild non-periodic variability of up to 1%. However, no stellar rotation period could be detected to high confidence.

U2 - 10.1051/0004-6361/201425395

DO - 10.1051/0004-6361/201425395

M3 - Article

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

SN - 0004-6361

ER -