ISPY - the NaCo Imaging Survey for Planets around Young stars: A young companion candidate embedded in the R CrA cloud

Abstract

Within the NaCo-ISPY exoplanet imaging program, we aim at detecting and characterizing the population of low-mass companions at wide separations ($\gtrsim$10AU), focusing in particular on young stars either hosting a known protoplanetary disk or a debris disk. R CrA is one of the youngest (1-3 Myr) and most promising objects in our sample because of two previous studies that suggested the presence of a close companion. Our aim is to directly image and characterize the companion for the first time. We observed R CrA twice with the NaCo instrument at VLT in the $L^{\prime }$ filter with a one year time baseline in between. The high-contrast imaging data were reduced and analyzed, and in both datasets the companion candidate was detected. The companion is detected at a separation of $196.8\pm 4.5$/$196.6\pm 5.9$ mas ($18.7\pm 1.3$/$18.7\pm 1.4$ AU) and position angle of $134.7\pm 0.5^{\circ }/133.7\pm 0.7^{\circ }$ in the first/second epoch observation. We measure a contrast of $7.29\pm 0.18$/$6.70\pm 0.15$ mag with respect to the primary. Stellar proper motion study rejects the hypothesis of the signal being a background object. The companion candidate orbits in the clockwise direction and, if on a face-on circular orbit, its period is $\sim 43-47$ yr. This value disagrees with the estimated orbital motion and therefore a face-on circular orbit may be excluded. Depending on the assumed age, extinction and brightness of the primary, the stellar companion has a mass between $0.10\pm 0.02M_{\odot }$ and $1.03_{-0.18}^{+0.20}{M}_{\odot }$ range, if no contribution from circumsecondary material is taken into account. The presence of the companion needs to be taken into account when analyzing the complex circumstellar environment of R CrA.

Accepted for publication in A&A (7 pages, 3 figures, 3 tables)

References in corpus (9)

• Direct Imaging of Multiple Planets Orbiting the Star HR 8799
• The Gemini Planet Imager: First Light
• Fundamental limitations of high contrast imaging set by small sample statistics
• Discovery of a warm, dusty giant planet around HIP65426
• HST Proper Motions and Stellar Dynamics in the Core of the Globular Cluster 47 Tucanae
• VLT/SPHERE robust astrometry of the HR8799 planets at milliarcsecond-level accuracy Orbital architecture analysis with PyAstrOFit
• Exploring the RCrA environment with SPHERE: Discovery of a new stellar companion
• A Pulsation Search Among Young Brown Dwarfs and Very Low Mass Stars
• A near-infrared survey of the entire R Corona Australis cloud

Cited by in corpus (7)

• ISPY -- NACO Imaging Survey for Planets around Young stars: Survey description and results from the first 2.5 years of observations
• Molecular mapping of the PDS70 system: No molecular absorption signatures from the forming planet PDS70 b
• ISPY-NACO Imaging Survey for Planets around Young stars. The demographics of forming planets embedded in protoplanetary disks
• Half-sibling regression meets exoplanet imaging: PSF modeling and subtraction using a flexible, domain knowledge-driven, causal framework
• Investigating the nature of the extended structure around the Herbig star RCrA using integral field and high-resolution spectroscopy
• ISPY -- NaCo Imaging Survey for Planets around Young stars. CenteR: the impact of centering and frame selection
• An optimised survey strategy for the ERIS/NIX imager: searching for young giant exoplanets and very low mass brown dwarfs using the K-peak custom photometric filter