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

Beth Biller; Sylvestre Lacour; Attila Juhasz; Myriam Benisty; Gael Chauvin; Johan Olofsson; Joerg-Uwe Pott; Andre Mueller; Aurora Sicilia-Aguilar; Mickael Bonnefoy; Peter Tuthill; Philippe Thebault; Thomas Henning; Aurelien Crida

doi:10.1088/2041-8205/753/2/L38

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

Beth Biller^*, Sylvestre Lacour, Attila Juhasz, Myriam Benisty, Gael Chauvin, Johan Olofsson, Joerg-Uwe Pott, Andre Mueller, Aurora Sicilia-Aguilar, Mickael Bonnefoy, Peter Tuthill, Philippe Thebault, Thomas Henning, Aurelien Crida

^*Corresponding author for this work

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract

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.

Original language	English
Article number	38
Number of pages	5
Journal	Astrophysical Journal Letters
Volume	753
Issue number	2
DOIs	https://doi.org/10.1088/2041-8205/753/2/L38
Publication status	Published - 10 Jul 2012

Keywords

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

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Biller, B., Lacour, S., Juhasz, A., Benisty, M., Chauvin, G., Olofsson, J., Pott, J.-U., Mueller, A., Sicilia-Aguilar, A., Bonnefoy, M., Tuthill, P., Thebault, P., Henning, T., & Crida, A. (2012). A LIKELY CLOSE-IN LOW-MASS STELLAR COMPANION TO THE TRANSITIONAL DISK STAR HD 142527. Astrophysical Journal Letters, 753(2), Article 38. https://doi.org/10.1088/2041-8205/753/2/L38

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

abstract = "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.",

keywords = "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",

author = "Beth Biller and Sylvestre Lacour and Attila Juhasz and Myriam Benisty and Gael Chauvin and Johan Olofsson and Joerg-Uwe Pott and Andre Mueller and Aurora Sicilia-Aguilar and Mickael Bonnefoy and Peter Tuthill and Philippe Thebault and Thomas Henning and Aurelien Crida",

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doi = "10.1088/2041-8205/753/2/L38",

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journal = "Astrophysical Journal Letters",

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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 - 2012/7/10

Y1 - 2012/7/10

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

KW - circumstellar matter

KW - planetary systems

KW - stars: emission-line, Be

KW - stars: low-mass

KW - HERBIG AE/BE STARS

KW - MAIN-SEQUENCE STARS

KW - CIRCUMBINARY DISCS

KW - APERTURE MASKING

KW - PLANET FORMATION

KW - EVOLUTION

KW - REGIONS

KW - IMAGES

KW - 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 - 38

ER -

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

Abstract

Keywords

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