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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/31663
Title: The GAPS programme at TNG. XXII. The GIARPS view of the extended helium atmosphere of HD 189733 b accounting for stellar activity
Authors: GUILLUY, GLORIA 
ANDRETTA, Vincenzo 
BORSA, Francesco 
GIACOBBE, Paolo 
SOZZETTI, Alessandro 
COVINO, Elvira 
Bourrier, V.
Fossati, L.
BONOMO, ALDO STEFANO 
Esposito, M.
Giampapa, M. S.
Harutyunyan, A.
RAINER, Monica 
Brogi, M.
BRUNO, GIOVANNI 
CLAUDI, Riccardo 
FRUSTAGLI, GIUSEPPE 
LANZA, Antonino Francesco 
Mancini, Luigi 
Pino, Lorenzo 
PORETTI, Ennio 
SCANDARIATO, GAETANO 
AFFER, Laura 
BAFFA, Carlo 
BARUFFOLO, Andrea 
BENATTI, SERENA 
BIAZZO, Katia 
BIGNAMINI, ANDREA 
Boschin, W.
Carleo, I.
Cecconi, M.
COSENTINO, Rosario 
Damasso, Mario 
DESIDERA, Silvano 
FALCINI, Gilberto 
Martinez Fiorenzano, A. F.
Ghedina, A.
González-Álvarez, E.
Guerra, J.
Hernandez, N.
LETO, Giuseppe 
MAGGIO, Antonio 
Malavolta, L. 
MALDONADO PRADO, Jesus 
MICELA, Giuseppina 
MOLINARI, Emilio Carlo 
NASCIMBENI, VALERIO 
PAGANO, Isabella 
Pedani, M.
PIOTTO , GIAMPAOLO 
Reiners, A.
Issue Date: 2020
Journal: ASTRONOMY & ASTROPHYSICS 
Number: 639
First Page: A49
Abstract: Context. Exoplanets orbiting very close to their parent star are strongly irradiated. This can lead the upper atmospheric layers to expand and evaporate into space. The metastable helium (He I) triplet at 1083.3 nm has recently been shown to be a powerful diagnostic to probe extended and escaping exoplanetary atmospheres. <BR /> Aims: We perform high-resolution transmission spectroscopy of the transiting hot Jupiter HD 189733 b with the GIARPS (GIANO-B + HARPS-N) observing mode of the Telescopio Nazionale Galileo, taking advantage of the simultaneous optical+near infrared spectral coverage to detect He I in the planet's extended atmosphere and to gauge the impact of stellar magnetic activity on the planetary absorption signal. <BR /> Methods: Observations were performed during five transit events of HD 189733 b. By comparison of the in-transit and out-of-transit GIANO-B observations, we computed high-resolution transmission spectra. We then used them to perform equivalent width measurements and carry out light-curves analyses in order to consistently gauge the excess in-transit absorption in correspondence with the He I triplet. <BR /> Results: We spectrally resolve the He I triplet and detect an absorption signal during all five transits. The mean in-transit absorption depth amounts to 0.75 ± 0.03% (25σ) in the core of the strongest helium triplet component. We detect night-to-night variations in the He I absorption signal likely due to the transit events occurring in the presence of stellar surface inhomogeneities. We evaluate the impact of stellar-activity pseudo-signals on the true planetary absorption using a comparative analysis of the He I 1083.3 nm (in the near-infrared) and the Hα (in the visible) lines. Using a 3D atmospheric code, we interpret the time series of the He I absorption lines in the three nights not affected by stellar contamination, which exhibit a mean in-transit absorption depth of 0.77 ± 0.04% (19σ) in full agreement with the one derived from the full dataset. In agreement with previous results, our simulations suggest that the helium layers only fill part of the Roche lobe. Observations can be explained with a thermosphere heated to ~12 000 K, expanding up to ~1.2 planetary radii, and losing ~1 g s<SUP>-1</SUP> of metastable helium. <BR /> Conclusions: Our results reinforce the importance of simultaneous optical plus near infrared monitoring when performing high-resolution transmission spectroscopy of the extended and escaping atmospheres of hot planets in the presence of stellar activity. <P />Based on observations made with the Italian Telescopio Nazionale Galileo (TNG) operated by the Fundación Galileo Galilei (FGG) of the Istituto Nazionale di Astrofisica (INAF) at the Observatorio del Roque de los Muchachos (La Palma, Canary Islands, Spain).
URI: http://hdl.handle.net/20.500.12386/31663
URL: https://www.aanda.org/articles/aa/full_html/2020/07/aa37644-20/aa37644-20.html
http://arxiv.org/abs/2005.05676v1
ISSN: 0004-6361
DOI: 10.1051/0004-6361/202037644
Bibcode ADS: 2020A&A...639A..49G
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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