A precise architecture characterization of the π Mensae planetary system

Damasso, M.; Sozzetti, A.; Lovis, C.; Barros, S. C. C.; Sousa, S. G.; Demangeon, O. D. S.; Faria, J. P.; Lillo-Box, J.; Cristiani, S.; Pepe, F.; Rebolo, R.; Santos, N. C.; Zapatero Osorio, M. R.; González Hernández, J. I.; Amate, M.; Pasquini, L.; Zerbi, F. M.; Adibekyan, V.; Abreu, M.; Affolter, M.; ... (2020). A precise architecture characterization of the π Mensae planetary system. Astronomy and astrophysics, 642, A31. EDP Sciences 10.1051/0004-6361/202038416

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The bright star π Men was chosen as the first target for a radial velocity follow-up to test the performance of ESPRESSO, the new high-resolution spectrograph at the ESO's Very-Large Telescope (VLT). The star hosts a multi-planet system (a transiting 4 M⊕ planet at ∼0.07 au, and a sub-stellar companion on a ∼2100-day eccentric orbit) which is particularly appealing for a precise multi-technique characterization. With the new ESPRESSO observations, that cover a time span of 200 days, we aim to improve the precision and accuracy of the planet parameters and search for additional low-mass companions. We also take advantage of new photometric transits of π Men c observed by TESS over a time span that overlaps with that of the ESPRESSO follow-up campaign. We analyse the enlarged spectroscopic and photometric datasets and compare the results to those in the literature. We further characterize the system by means of absolute astrometry with Hipparcos and Gaia. We used the spectra of ESPRESSO for an independent determination of the stellar fundamental parameters. We present a precise characterization of the planetary system around π Men. The ESPRESSO radial velocities alone (with typical uncertainty of 10 cm/s) allow for a precise retrieval of the Doppler signal induced by π Men c. The residuals show an RMS of 1.2 m/s, and we can exclude companions with a minimum mass less than ∼2 M⊕ within the orbit of π Men c). We improve the ephemeris of π Men c using 18 additional TESS transits, and in combination with the astrometric measurements, we determine the inclination of the orbital plane of π Men b with high precision (ib=45.8+1.4−1.1 deg). This leads to the precise measurement of its absolute mass mb=14.1+0.5−0.4 MJup, and shows that the planetary orbital planes are highly misaligned.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Space Research and Planetary Sciences > Theoretical Astrophysics and Planetary Science (TAPS)
08 Faculty of Science > Physics Institute > Space Research and Planetary Sciences
08 Faculty of Science > Physics Institute
08 Faculty of Science > Physics Institute > NCCR PlanetS

UniBE Contributor:

Alibert, Yann; Bandy, Timothy John; Benz, Willy and Broeg, Christopher

Subjects:

500 Science > 520 Astronomy
600 Technology > 620 Engineering
500 Science

ISSN:

0004-6361

Publisher:

EDP Sciences

Language:

English

Submitter:

Janine Jungo

Date Deposited:

25 Feb 2021 10:27

Last Modified:

28 Feb 2021 02:57

Publisher DOI:

10.1051/0004-6361/202038416

BORIS DOI:

10.48350/152633

URI:

https://boris.unibe.ch/id/eprint/152633

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