TY - JOUR
T1 - A likely close-in low-mass stellar companion to the transitional disk star HD 142527
AU - Biller, Beth
AU - Lacour, Sylvestre
AU - Juhasz, Attila
AU - Benisty, Myriam
AU - Chauvin, Gael
AU - Olofsson, Johan
AU - Pott, Joerg-Uwe
AU - Mueller, Andre
AU - Sicilia-Aguilar, Aurora
AU - Bonnefoy, Mickael
AU - Tuthill, Peter
AU - Thebault, Philippe
AU - Henning, Thomas
AU - Crida, Aurelien
PY - 2012/6/26
Y1 - 2012/6/26
N2 - With the uniquely high contrast within 0 ''.1 (Delta mag(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 (3 sigma 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 similar to 0.1-0.4 M-circle dot. 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.
AB - With the uniquely high contrast within 0 ''.1 (Delta mag(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 (3 sigma 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 similar to 0.1-0.4 M-circle dot. 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.
KW - brown dwarfs circumstellar matter planetary systems stars: emission-line, Be stars: low-mass HERBIG AE/BE STARS MAIN-SEQUENCE STARS CIRCUMBINARY DISCS APERTURE MASKING PLANET FORMATION EVOLUTION REGIONS IMAGES LINE
U2 - 10.1088/2041-8205/753/2/L38
DO - 10.1088/2041-8205/753/2/L38
M3 - Article
SN - 2041-8205
VL - 753
JO - Astrophysical Journal Letters
JF - Astrophysical Journal Letters
IS - 2
M1 - L38
ER -