publication . Conference object . Other literature type . Article . Preprint . 2021

Strong H-alpha emission and signs of accretion in a circumbinary planetary mass companion from MUSE

Simon C. Eriksson; Ruben Asensio Torres; Markus Janson; Yuhiko Aoyama; G.-D. Marleau; Mickael Bonnefoy; Simon Petrus;
Open Access English
  • Published: 18 Feb 2021
  • Publisher: Zenodo
Abstract
Context. Intrinsic H$\alpha$ emission can be advantageously used to detect substellar companions because it improves contrasts in direct imaging. Characterising this emission from accreting exoplanets allows for the testing of planet formation theories. Aims. We characterise the young circumbinary planetary mass companion 2MASS J01033563-5515561 (AB)b (Delorme 1 (AB)b) through medium-resolution spectroscopy. Methods. We used the new narrow-field mode (NFM) for the MUSE integral-field spectrograph, located on the ESO Very Large Telescope, during science verification time to obtain optical spectra of Delorme 1 (AB)b. Results. We report the discovery of very strong H$\alpha$ and H$\beta$ emission, accompanied by He I emission. This is consistent with an active accretion scenario. We provide accretion rate estimates obtained from several independent methods and find a likely mass of $12-15$ M$_{\rm Jup}$ for Delorme 1 (AB)b. This is also consistent with previous estimates. Conclusions. Signs of active accretion in the Delorme 1 system might indicate a younger age than the $\sim 30-40$ Myr expected from a likely membership in Tucana-Horologium (THA). Previous works have also shown the central binary to be overluminous, which gives further indication of a younger age. However, recent discoveries of active discs in relatively old ($\sim 40$ Myr), very low-mass systems suggests that ongoing accretion in Delorme 1 (AB)b might not require in and of itself that the system is younger than the age implied by its THA membership.
Comment: 9 pages. Supplementary material and figures in appendix
Sustainable Development Goals (SDG) [Beta]
Subjects
free text keywords: Circumbinary, Exoplanet, Accretion, Young stars, Very low mass stars, Astrophysics - Earth and Planetary Astrophysics, Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - Solar and Stellar Astrophysics, Space and Planetary Science, Astronomy and Astrophysics, Accretion (astrophysics), Planetary system, Exoplanet, Younger age, Very Large Telescope, Circumbinary planet, Physics, Planet, Astrophysics, Planetary mass
Funded by
SNSF| PlanetsInTime: The history of planets from their origins to present day
Project
  • Funder: Swiss National Science Foundation (SNSF)
  • Project Code: BSSGI0_155816
  • Funding stream: Programmes | EU Transitory Measures ; Programmes;Horizon Europe Transitional Measures | SNSF Starting Grants ; Programmes;EU Transitory Measures | SNSF Starting Grants ; Programmes | Temporary Backup Schemes
,
EC| Origins
Project
Origins
From Planet-Forming Disks to Giant Planets
  • Funder: European Commission (EC)
  • Project Code: 832428
  • Funding stream: H2020 | ERC | ERC-ADG
Validated by funder
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Open Access
https://doi.org/10.5281/zenodo...
Conference object . 2021
Providers: Datacite
Open Access
ZENODO
Other literature type . 2021
Providers: ZENODO

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