1. Multi-band high resolution spectroscopy rules out the hot Jupiter BD+20 1790b - First data from the GIARPS Commissioning
- Author
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Andrea Baruffolo, Alessandro Sozzetti, E. González-Álvarez, Raffaele Gratton, M. Cecconi, Luca Malavolta, Alfio Puglisi, G. Falcini, Livia Origlia, Andrea Bignamini, M. Iuzzolino, C. Riverol, Daniela Fantinel, Adriano Ghedina, Salvatore Scuderi, Riccardo Claudi, A. Galli, Ilaria Carleo, S. Messina, Rosario Cosentino, Jesus Maldonado, Carlo Baffa, N. Buchschacher, Silvano Desidera, Ulf Seemann, Emilio Molinari, Kimberly R. Sokal, J. San Juan, Andrea Tozzi, Giuseppina Micela, Kyle F. Kaplan, Avet Harutyunyan, Benjamin Kidder, Monica Rainer, Gregory N. Mace, M. Sozzi, Serena Benatti, Juan Carlos Guerra, F. Ghinassi, M. Gonzalez, Nicoletta Sanna, Antonino F. Lanza, L. Riverol, M. Endl, Concepción Iglesias González, H. Perez Ventura, D. Fugazza, N. Hernandez, Elisabetta Giani, Ernesto Oliva, Marcello Lodi, E. Sissa, M. Hernandez Diaz, Luca Fini, and ITA
- Subjects
Physics ,Earth and Planetary Astrophysics (astro-ph.EP) ,010308 nuclear & particles physics ,FOS: Physical sciences ,Astronomy and Astrophysics ,Context (language use) ,Astrophysics ,01 natural sciences ,7. Clean energy ,Radial velocity ,Photometry (astronomy) ,Stars ,Amplitude ,Astrophysics - Solar and Stellar Astrophysics ,13. Climate action ,Space and Planetary Science ,Planet ,0103 physical sciences ,Hot Jupiter ,Spectroscopy ,010303 astronomy & astrophysics ,Solar and Stellar Astrophysics (astro-ph.SR) ,Astrophysics - Earth and Planetary Astrophysics - Abstract
Context. Stellar activity is currently challenging the detection of young planets via the radial velocity (RV) technique. Aims. We attempt to definitively discriminate the nature of the RV variations for the young active K5 star BD+20 1790, for which visible (VIS) RV measurements show divergent results on the existence of a substellar companion. Methods. We compare VIS data with high precision RVs in the near infrared (NIR) range by using the GIANO - B and IGRINS spectrographs. In addition, we present for the first time simultaneous VIS-NIR observations obtained with GIARPS (GIANO - B and HARPS - N) at Telescopio Nazionale Galileo (TNG). Orbital RVs are achromatic, so the RV amplitude does not change at different wavelengths, while stellar activity induces wavelength-dependent RV variations, which are significantly reduced in the NIR range with respect to the VIS. Results. The NIR radial velocity measurements from GIANO - B and IGRINS show an average amplitude of about one quarter with respect to previously published VIS data, as expected when the RV jitter is due to stellar activity. Coeval multi-band photometry surprisingly shows larger amplitudes in the NIR range, explainable with a mixture of cool and hot spots in the same active region. Conclusions. In this work, the claimed massive planet around BD+20 1790 is ruled out by our data. We exploited the crucial role of multi- wavelength spectroscopy when observing young active stars: thanks to facilities like GIARPS that provide simultaneous observations, this method can reach its maximum potential., 12 pages, 7 figures
- Published
- 2018