A LIKELY CLOSE-IN LOW-MASS STELLAR COMPANION TO THE TRANSITIONAL DISK STAR HD 142527

By B. Biller, S. Lacour, A. Juh'asz, M. Benisty, G. Chauvin, J. Olofsson, J. Pott, A. Müller, A. Sicilia-Aguilar, M. Bonnefoy and 4 more. 2012

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With the uniquely high contrast within 0.″1 (Δmag(L′) = 5–6.5 mag) available using Sparse Aperture Masking with NACO at Very Large Telescope, we detected asymmetry in the flux from the Herbig Fe star HD 142527 with a barycenter emission situated at a projected separation of 88 ± 5 mas (12.8 ± 1.5 AU at 145 pc) and flux ratios in H, K, and L′ of 0.016 ± 0.007, 0.012 ± 0.008, and 0.0086 ± 0.0011, respectively (3σ errors), relative to the primary star and disk. After extensive closure-phase modeling, we interpret this detection as a close-in, low-mass stellar companion with an estimated mass of ∼0.1–0.4 M☉. HD 142527 has a complex disk structure, with an inner gap imaged in both the near and mid-IR as well as a spiral feature in the outer disk in the near-IR. This newly detected low-mass stellar companion may provide a critical explanation of the observed disk structure.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/a0c76706d57353f128a44c2c46b90cbc5eea8201

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In Astronomy and Astrophysics

1. B. Bowler
2. C. Dullemond
3. Simon Bruderer
4. Th. Henning
5. H. Klahr
6. M. Benisty
7. R. van Boekel
8. P. Pinilla

Citations in the corpus

• STRUCTURES IN THE PROTOPLANETARY DISK OF HD142527 SEEN IN POLARIZED SCATTERED LIGHT (2013, background): “Such a planet is still feasible even if the stellar companion proposed by Biller et al. (2012) is real.”
• Imaging Extrasolar Giant Planets (2016, background): “…been quite fruitful, resulting in the discovery of companions within these gaps spanning the stellar (CoKu Tau 4: Ireland & Kraus 2008; HD 142527: Biller et al. 2012, Close et al. 2014, Rodigas et al. 2014, Lacour et al. 2015), brown dwarf (HD 169142: Biller et al. 2014, Reggiani et al. 2014),…”
• Gaps, Rings, and Non-Axisymmetric Structures in Protoplanetary Disks - From Simulations to ALMA Observations (2014, background): “…in the systems Oph IRS 48 (van der Marel et al. 2013), LkHα 330 (Isella et al. 2013), SAO 206462 and SR 21 (Pérez et al. 2014), or in HD 142527 (Casassus et al. 2013; Fukagawa et al. 2013), in which one has recently found a low-mass stellar companion (Biller et al. 2012; Close et al. 2014).”
• Shadows and spirals in the protoplanetary disk HD 100453 (2016, background): “Such a companion was detected in the cavity of the disk HD 142527 (Biller et al. 2012; Close et al. 2014) and found to be on an eccentric orbit (Lacour et al. 2016).”
• SHADOWS CAST BY A WARP IN THE HD 142527 PROTOPLANETARY DISK (2014, background): “A question arises as to the origin of this warped disk, which is probably driven by the low-mass companion (Biller et al. 2012; Rodigas et al. 2014; Close et al. 2014), although it could also be linked with the disk-envelope interaction leading to the formation of the binary in the class I stage.”