A joint effort to discover and characterize two resonant mini Neptunes around TOI-1803 with TESS, HARPS-N and CHEOPS

Autor(en)

T. Zingales, L. Malavolta, L. Borsato, D. Turrini, A. Bonfanti, D. Polychroni, G. Mantovan, D. Nardiello, V. Nascimbeni, A. F. Lanza, A. Bekkelien, A. Sozzetti, C. Broeg, L. Naponiello, M. Lendl, A. S. Bonomo, A. E. Simon, S. Desidera, G. Piotto, L. Mancini, M. J. Hooton, A. Bignamini, J. A. Egger, A. Maggio, Y. Alibert, D. Locci, L. Delrez, F. Biassoni, L. Fossati, L. Cabona, G. Lacedelli, I. Carleo, P. Leonardi, G. Andreuzzi, A. Brandeker, R. Cosentino, A. C. M. Correia, R. Claudi, R. Alonso, M. Damasso, T. G. Wilson, T. Bàrczy, M. Pinamonti, D. Baker, K. Barkaoui, D. Barrado Navascues, S. C. C. Barros, W. Baumjohann, T. Beck, C. Beichman, W. Benz, A. Bieryla, N. Billot, P. Bosch-Cabot, L. G. Bouma, D. R. Ciardi, A. Collier Cameron, K. A. Collins, Ian J. M. Crossfield, Sz. Csizmadia, P. E. Cubillos, M. B. Davies, M. Deleuil, A. Deline, O. D. S. Demangeon, B. O. Demory, A. Derekas, D. Dragomir, B. Edwards, D. Ehrenreich, A. Erikson, B. Falk, A. Fortier, M. Fridlund, A. Fukui, D. Gandolfi, K. Gazeas, M. Gillon, E. Gonzales, M. Güdel, P. Guerra, M. N. Guunther, A. Heitzmann, Ch. Helling, S. B. Howell, K. G. Isaak, J. Jenkins, L. L. Kiss, J. Korth, K. W. F. Lam, J. Laskar, A. Lecavelier des Etangs, D. Magrin, R. Matson, E. C. Matthews, P. F. L. Maxted, S. McDermott, M. Munari, C. Mordasini, N. Narita, G. Olofsson, R. Ottensamer, I. Pagano, E. Pallè, G. Peter, D. Pollacco, D. Queloz, R. Ragazzoni, N. Rando, F. Ratti, H. Rauer, I. Ribas, S. Salmon, N. C. Santos, G. Scandariato, S. Seager, D. Sègransan, A. M. S. Smith, J. Schlieder, R. P. Schwarz, A. Shporer, S. G. Sousa, M. Stalport, M. Steinberger, S. Sulis, Gy. M. Szabò, J. D. Twicken, S. Udry, V. Van Grootel, J. Venturini, E. Villaver, N. A. Walton, J. N. Winn

Abstrakt

We present the discovery of two mini Neptunes near a 2:1 orbital

resonance configuration orbiting the K0 star TOI-1803. We describe their

orbital architecture in detail and suggest some possible formation and

evolution scenarios. Using CHEOPS, TESS, and HARPS-N datasets we can

estimate the radius and the mass of both planets. We used a

multidimensional Gaussian Process with a quasi-periodic kernel to

disentangle the planetary components from the stellar activity in the

HARPS-N dataset. We performed dynamical modeling to explain the orbital

configuration and performed planetary formation and evolution

simulations. For the least dense planet, we define possible atmospheric

characterization scenarios with simulated JWST observations. TOI-1803 b

and TOI-1803 c have orbital periods of $\sim$6.3 and $\sim$12.9 days,

respectively, residing in close proximity to a 2:1 orbital resonance.

Ground-based photometric follow-up observations revealed significant

transit timing variations (TTV) with an amplitude of $\sim$10 min and

$\sim$40 min, respectively, for planet -b and -c. With the masses

computed from the radial velocities data set, we obtained a density of

(0.39$\pm$0.10) $\rho_{earth}$ and (0.076$\pm$0.038) $\rho_{earth}$ for

planet -b and -c, respectively. TOI-1803 c is among the least dense mini

Neptunes currently known, and due to its inflated atmosphere, it is a

suitable target for transmission spectroscopy with JWST. We report the

discovery of two mini Neptunes close to a 2:1 orbital resonance. The

detection of significant TTVs from ground-based photometry opens

scenarios for a more precise mass determination. TOI-1803 c is one of

the least dense mini Neptune known so far, and it is of great interest

among the scientific community since it could constrain our formation

scenarios.

Organisation(en)

Institut für Astrophysik

Journal

Astronomy & Astrophysics

ISSN

0004-6361

Publikationsdatum

12-2024

Peer-reviewed

Ja

ÖFOS 2012

103003 Astronomie, 103004 Astrophysik

Schlagwörter

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/237a1096-3acd-4311-be59-af5b168d1c6b