16th GAPS meeting

4 May 2020, 09:30 → 6 May 2020, 17:30 Europe/Rome

Virtual meeting

Antonio Maggio (Istituto Nazionale di Astrofisica (INAF)), Valentina D'Orazi (Istituto Nazionale di Astrofisica (INAF)), Silvano Desidera (INAF OAPd)

The 16th GAPS progress meeting will be held on May 4-6, 2020.

Due to the emergency caused by COVID-19, we will have a virtual meeting through Google meet: 

meet.google.com/emq-iwxo-gkx

Monday, 4 May

09:30 → 11:35 General Session

09:30 Exoplanets at TNG

The status of the programs on the exoplanets at TNG will be reviewed, with a particular emphasis on the current difficult situation.

Speaker: Ennio Poretti (Istituto Nazionale di Astrofisica (INAF))

09:55 Updates on HARPS-N

Speaker: Rosario Cosentino (Istituto Nazionale di Astrofisica (INAF))

10:15 Report delle osservazioni di GAPS2.0

In questo contributo sono riportate le statistiche delle notti di osservazione dall'inizio del long program GAPS2.0. In particolare, vengono mostrate le statistiche relative al run AOT40 (appena finito) e quelle relative al run AOT41 (appena cominciato).

Speaker: Dr Riccardo Claudi

10:35 Wavelength calibration for GIANO-B spectra

Speaker: Matteo Brogi

10:55 GAPS1 - What's left?

Breve discussione di analisi dei programmi GAPS1 ancora pendenti.

Speaker: Alessandro Sozzetti

11:05 GAPS1-HADES

Updates/results from GAPS1-HADES

Speaker: Matteo Pinamonti (Istituto Nazionale di Astrofisica (INAF))

11:20 nuova WBS e PMP

Speaker: Antonio Maggio (Istituto Nazionale di Astrofisica (INAF))

14:30 → 16:30 GAPS Young

14:30 Status programma Young Objects

Sommario delle osservazioni, del campione stellare e delle attivita' del programma Young Objects, inclusa la definizione delle criticita' rilevate.

Speaker: Dr Serena Benatti (Istituto Nazionale di Astrofisica (INAF))

14:50 Update on V830 Tau/YO01

I will present the results for V830 Tau after the third observing season with HARPS-N came to an end. The talk will be structured following the emerging structure of the draft in preparation, highlighting the concept and the main points to be addressed in the publication.

Speaker: Mr Mario Damasso (INAF-OATo)

15:10 Status of YO analysis

I'll give a brief summary of the status of the analysis of the Young Object target YO14

Speaker: Luca Malavolta (Università degli Studi di Padova)

15:30 Status dello studio del sistema YO36

YO36 è una stella giovane attorno nella curva di luce K2 della quale sono stati osservati i transiti di quattro oggetti diversi. La stella è molto attiva e le misure di Velocità Radiale ottenute fin'ora non sembrano mostrare segnali kepleriani.

Speaker: Dr Riccardo Claudi

15:50 YO38: validation study for TOI-942

Here we present a validation study for the TESS object of interest TOI-942. We performed a follow-up of this object with HARPS-N, collecting about 30 spectra. The HARPS-N spectra allow us to characterise the star and confirm the presence of the planet.

Speaker: Ilaria Carleo

16:10 Discussion

Speaker: ALL

Tuesday, 5 May

09:30 → 11:40 GAPS Atmospheres

09:30 Introduction

A general introduction about the current state of the VIS/NIR observations and analysis, and the future prospects

Speakers: Aldo Stefano Bonomo (Istituto Nazionale di Astrofisica (INAF)), Valerio Nascimbeni (INAF-OAPD)

09:45 Update on the VIS analysis with SLOPpy

Update on the VIS analysis with SLOPpy

Speaker: Daniela Sicilia (Università di Padova)

10:05 Reflected light from 51 Peg b

Reflected light from 51 Peg b

Speaker: Gaetano Scandariato (Istituto Nazionale di Astrofisica (INAF))

10:25 Atmospheric RML effect of KELT-20b

Atmospheric RML effect of KELT-20b

Speaker: Monica Rainer (Istituto Nazionale di Astrofisica (INAF))

10:45 H-alpha absorption on WASP-33b

H-alpha absorption on WASP-33b

Speaker: Francesco Borsa (Istituto Nazionale di Astrofisica (INAF))

11:05 The unexpected chemistry of HD209458

By performing high-resolution transmission spectroscopy with GIANO-B over the whole near-infrared, we measured the signature of seven molecular species via cross correlation with model spectra.

Speaker: Paolo Giacobbe (Istituto Nazionale di Astrofisica (INAF))

11:25 Disequilibrium chemistry in the atmospheres of the three warm giant planets WASP-69 b, WASP-107b and WASP-80b

Here we report preliminary results of the atmospheric studies we performed on the three warm giant planets, Wasp-69b, Wasp-107b and Wasp-80b. By using the PCA technique, and the cross-correlation method, we succeeded in detecting 7 molecules in these exo-atmospheres. Given the low temperature of the investigated exoplanets, some of these molecules are un-expected by equilibrium theories, we have thus to bring up the disequilibrium chemistry to explain our finding.

Speaker: Gloria Guilluy (Istituto Nazionale di Astrofisica (INAF))

14:30 → 15:25 Modelling and interpretation

14:30 Modelling exoplanet atmospheres to interpret GIANO observations

Near-infrared high-resolution spectroscopy relies on cross correlation with model spectra to extract information about the chemical and physical conditions of exoplanet atmospheres. In this talk I will review recent efforts to identify the most reliable molecular line lists applicable to simulate the high temperatures of extrasolar planets. Furthermore, I will explain how GIANO could be used to detect transmission spectra of cloudy exoplanets and distinguish cloudy atmospheres from atmospheres with a high metallicity, currently challenging at low spectral resolution.

Speaker: Matteo Brogi (University of Warwick)

14:50 Understanding the XUV-induced Atmospheric Erosion of Young Planets and their Evolution With Time

In the talk we will discuss the effects of X-ray and ultraviolet radiation on atmospheric erosion around young stars. Specifically, we focus on the bimodal distribution of exoplanet radii (i.e. “The Fulton Gap”; Fulton et al. 2017). In Modirrousta-Galian et al. (2020,b) this distribution is theoretically analysed in order to make several predictions that can be astronomically tested. For instance, a transition region from $1.75 – 2.00R_{\oplus}$ full of planets with and without hydrogen atmospheres is expected. Within this region a small peak in mega-Earths (telluric planets with masses greater than $10M_{\oplus}$) is also probable. These are the remnant cores of bodies which originally had much larger atmospheres but then lost them. Furthermore, whilst it cannot be currently verified, a potential mass distribution in exoplanets is shown. Finally, the dependence of the initial and present radius distributions on system parameters (i.e. equilibrium temperature, stellar temperature, and orbital distance) will be discussed.

Speaker: Darius Modirrousta Galian (Istituto Nazionale di Astrofisica (INAF))

15:10 Evaporation models and the importance of determining the parameters of young planets

The knowledge of planetary mass and radius of young planets is crucial in the understanding if their atmospheres can survive at the intense XUV stellar irradiation

Speaker: Daniele Locci

15:30 → 17:30 GAPS Special Objects

15:30 Special Objects - ovierview del programma

I will summarize the status of the special objects program

Speaker: Alessandro Sozzetti

15:50 Special Objects - aggiornamento M108

I will provide an update on M108

Speaker: Matteo Pinamonti

16:05 Special Objects - aggiornamento M109 + M112

I will provide an update on M109 and M112

Speaker: Domenico Barbato

16:35 Special Objects - aggiornamento nane M GAPS1

I will provide an update on the old GAPS1 M dwarfs followed as special objects

Speaker: Laura Affer

Wednesday, 6 May

09:30 → 11:30 Perspectives and synergies

09:30 Special objects: discussion and perspectives

Speaker: Alessandro Sozzetti (Istituto Nazionale di Astrofisica (INAF))

09:50 Coordinations with GTO and TFOP

Speaker: Alessandro Sozzetti (Istituto Nazionale di Astrofisica (INAF))

10:10 GAPS – CHEOPS Synergies

Speaker: Giampaolo Piotto

10:30 Discussion

Speaker: ALL

14:30 → 16:50 Additional works

14:30 Atmospheric parameters and chemical composition of YO stars

The detailed characterisation of stars is important in many astrophysical fields. In particular, knowing with great precision the atmospheric parameters and chemical composition of planet hosting stars allows to fully characterise exoplanets and address a number of aspects, e.g. the planet-metallicity relation.
In our work, we performed a precise determination of the atmospheric parameters and a detailed chemical analysis of high-resolution spectra of stars observed by the GAPS consortium. The selected targets are intermediate-age stars (< 700 Myr), that have been observed simultaneously in the optical with HARPS-N and in the near infrared with GIANO-B spectrographs at TNG, in GIARPS mode. We analysed the spectra by applying a new method, that exploits the use of titanium lines to derive the atmospheric parameters, in particular surface gravities and microturbulence velocity parameter. The resulting parameters have been used to derive the abundances in the optical and NIR spectra through equivalent width and spectral synthesis methods, respectively. We derived abundances for eleven atomic species: C I, Na I, Mg I, Al I, Si I, Ca I, Ti I, Ti II, Cr I, Cr II, Fe I, Fe II, Ni I and Zn I. Our spectroscopic determination of the atmospheric parameters are in excellent agreement with the initial photometric guesses. We also found a good agreement between the optical and NIR abundances, with all stars having close-to-solar metallicities. The lack of systematic trends between elemental abundances and effective temperatures validates our methods. However, we observed that the coolest stars in the sample, with T < 5400 K, display higher abundances for the ionised species, in particular Cr II, and for high-excitation potential C I lines. On the contrary, carbon abundances derived from CH molecular band at 4300 A, do not display the same behaviour as the optical C I estimates.

Speaker: Martina Baratella (Università degli studi di Padova)

14:50 The abundance signature of low-mass stars with planets.

Methods to derive in a consistent way stellar abundances of low-mass stars from optical spectra are still missing. In this contribution we present a first attempt to fill this gap. Our methodology is based on the use of principal componen analysis and sparse Bayesian’s fitting methods. A set of M dwarfs in binary systems orbiting around an FGK primary was observed and is used to training our methods. We use our results to test whether the correlations between the metallicity, individual chemical abundances, mass of the star and the presence of different type of planets found for FGK stars still holds for the less massive M dwarf stars.

Speaker: Jesus Maldonado Prado (Istituto Nazionale di Astrofisica (INAF))

15:10 RV follow-up prediction

Speaker: Serena Benatti (Istituto Nazionale di Astrofisica (INAF))

15:30 Transiting Planet Host Activity 2

In questo contributo è presentato lo stato dello studio dell'attività delle stelle ospite di pianeti transitanti. Sono trattati sistemi osservati duranti GAPS1.0 e confrontati con altri sistemi transitanti e stelle di campo.

Speaker: Dr Riccardo Claudi

15:50 Correcting the impact of stellar spots on ARIEL transmission spectra

In my study, I analyze the impact of stellar spots on ARIEL observations and their effects on the extraction of the planetary signal from primary transit observations. I develop a method to determine the size and temperature of the spots by using the out-of-transit observations and I define a procedure to reliably extract the planetary spectrum in the presence of spots.

Speaker: Giancluca Cracchiolo

16:10 Discussion

Speaker: ALL