Transmission spectroscopy of the hot Jupiter TrES-3 b: Disproof of an overly 
large Rayleigh-like feature

Mackebrandt, Felix; Mallonn, M.; Ohlert, J. M.; Granzer, T.; Lalitha, S.; Muñoz, A. García; Gibson, N. P.; Lee, J. W.; Sozzetti, A.; Turner, J. D.; Vaňko, M.; Strassmeier, K. G.

doi:10.1051/0004-6361/201730512

Item

ITEM ACTIONSEXPORT

Add to Basket

Local TagsRelease HistoryDetailsSummary

Released

Journal Article

Transmission spectroscopy of the hot Jupiter TrES-3 b: Disproof of an overly large Rayleigh-like feature

MPS-Authors

/persons/resource/persons214094

Mackebrandt, Felix
Department Solar and Stellar Interiors, Max Planck Institute for Solar System Research, Max Planck Society;

External Resource

No external resources are shared

Fulltext (restricted access)

There are currently no full texts shared for your IP range.

Fulltext (public)

There are no public fulltexts stored in PuRe

Supplementary Material (public)

There is no public supplementary material available

Citation

Mackebrandt, F., Mallonn, M., Ohlert, J. M., Granzer, T., Lalitha, S., Muñoz, A. G., et al. (2017). Transmission spectroscopy of the hot Jupiter TrES-3 b: Disproof of an overly large Rayleigh-like feature. Astronomy and Astrophysics, 608: A26. doi:10.1051/0004-6361/201730512.

Cite as: https://hdl.handle.net/21.11116/0000-0001-41C2-A

Abstract

Context. Transit events of extrasolar planets offer the opportunity to study the composition of their atmospheres. Previous work on transmission spectroscopy of the close-in gas giant (TrES)-3 b revealed an increase in absorption towards blue wavelengths of very large amplitude in terms of atmospheric pressure scale heights, too large to be explained by Rayleigh-scattering in the planetary atmosphere. Aims. We present a follow-up study of the optical transmission spectrum of the hot Jupiter TrES-3 b to investigate the strong increase in opacity towards short wavelengths found by a previous study. Furthermore, we aim to estimate the effect of stellar spots on the transmission spectrum. Methods. This work uses previously published long slit spectroscopy transit data of the Gran Telescopio Canarias (GTC) and published broad band observations as well as new observations in different bands from the near-UV to the near-IR, for a homogeneous transit light curve analysis. Additionally, a long-term photometric monitoring of the TrES-3 host star was performed. Results. Our newly analysed GTC spectroscopic transit observations show a slope of much lower amplitude than previous studies. We conclude from our results the previously reported increasing signal towards short wavelengths is not intrinsic to the TrES-3 system. Furthermore, the broad band spectrum favours a flat spectrum. Long-term photometric monitoring rules out a significant modification of the transmission spectrum by unocculted star spots.