Exploring the realm of scaled solar system analogues with HARPS

Barbato, D.; Sozzetti, A.; Desidera, S.; Damasso, M.; Bonomo, A. S.; Giacobbe, P.; Colombo, L. S.; Lazzoni, C.; Claudi, R.; Gratton, R.; LoCurto, G.; Marzari, F.; Mordasini, Christoph (2018). Exploring the realm of scaled solar system analogues with HARPS. Astronomy and astrophysics, 615, A175. EDP Sciences 10.1051/0004-6361/201832791

[img]
Preview
Text
1804.08329.pdf - Accepted Version
Available under License Publisher holds Copyright.

Download (4MB) | Preview
[img] Text
aa32791-18.pdf - Published Version
Restricted to registered users only
Available under License Publisher holds Copyright.

Download (5MB) | Request a copy

Context. The assessment of the frequency of planetary systems reproducing the Solar System's architecture is still an open problem. Detailed study of multiplicity and architecture is generally hampered by limitations in quality, temporal extension and observing strategy, causing difficulties in detecting low-mass inner planets in the presence of outer giant planetary bodies. Aims. We present the results of high-cadence and high-precision HARPS observations on 20 solar-type stars known to host a single long-period giant planet in order to search for additional inner companions and estimate the occurence rate fp of scaled Solar System analogs, i.e. systems featuring lower-mass inner planets in the presence of long-period giant planets. Methods. We carry out combined fits of our HARPS data with literature radial velocities using differential evolution MCMC to refine the literature orbital solutions and search for additional inner planets. We then derive the survey detection limits to provide preliminary estimates of fp. Results. We generally find better constrained orbital parameters for the known planets than those found in the literature. While no additional inner planet is detected, we find evidence for previously unreported long-period massive companions in systems HD 50499 and HD 73267. We finally estimate the frequency of inner low mass (10-30 M⊕) planets in the presence of outer giant planets as fp<9.84% for P<150 days. Our preliminary estimate of fp is significantly lower than the values found in the literature; the lack of inner candidate planets found in our sample can also be seen as evidence corroborating the inward migration formation model for super-Earths and mini-Neptunes. Conclusions. Our results also underline the need for high-cadence and high-precision follow-up observations as the key to precisely determine the occurence of Solar System analogs.

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:

Mordasini, Christoph

Subjects:

500 Science
500 Science > 520 Astronomy
500 Science > 530 Physics
600 Technology > 620 Engineering

ISSN:

0004-6361

Publisher:

EDP Sciences

Language:

English

Submitter:

Janine Jungo

Date Deposited:

18 Jun 2019 07:39

Last Modified:

18 Jun 2019 07:39

Publisher DOI:

10.1051/0004-6361/201832791

ArXiv ID:

1804.08329v1

BORIS DOI:

10.7892/boris.128846

URI:

https://boris.unibe.ch/id/eprint/128846

Actions (login required)

Edit item Edit item
Provide Feedback