Spectroscopic signatures of magnetospheric accretion in Herbig Ae/Be stars. I. The case of HD101412

Abstract

Models of magnetically-driven accretion and outflows reproduce many observational properties of T Tauri stars. This concept is not well established for the more massive Herbig Ae/Be stars. We intend to examine the magnetospheric accretion in Herbig Ae/Be stars and search for rotational modulation using spectroscopic signatures, in this first paper concentrating on the well-studied Herbig Ae star HD101412. We used near-infrared spectroscopic observations of the magnetic Herbig Ae star HD101412 to test the magnetospheric character of its accretion disk/star interaction. We reduced and analyzed 30 spectra of HD101412, acquired with the CRIRES and X-shooter spectrographs installed at the VLT (ESO, Chile). The spectroscopic analysis was based on the He I lambda 10,830 and Pa gamma lines, formed in the accretion region. We found that the temporal behavior of these diagnostic lines in the near-infrared spectra of HD101412 can be explained by rotational modulation of line profiles generated by accreting gas with a period P = 20.53+-1.68 d. The discovery of this period, about half of the magnetic rotation period P_m = 42.076 d previously determined from measurements of the mean longitudinal magnetic field, indicates that the accreted matter falls onto the star in regions close to the magnetic poles intersecting the line-of-sight two times during the rotation cycle. We intend to apply this method to a larger sample of Herbig Ae/Be stars.

arXiv comment8 pages, 1 table, 7 figures, accepted for publication in A&A

References in corpus (18)

• The generalised Lomb-Scargle periodogram. A new formalism for the floating-mean and Keplerian periodograms
• Three-dimensional Simulations of Disk Accretion to an Inclined Dipole: II. Hot Spots and Variability
• A high-resolution spectropolarimetric survey of Herbig Ae/Be stars - I. Observations and measurements
• Three-dimensional Simulations of Disk Accretion to an Inclined Dipole: I. Magnetospheric Flow at Different Theta
• Probing T Tauri Accretion and Outflow with 1 Micron Spectroscopy
• Characterisation of the magnetic field of the Herbig Be star HD 200775
• Discovery of the pre-main sequence progenitors of the magnetic Ap/Bp stars?
• Accretion, Outflows, and Winds of Magnetized Stars
• Searching for a link between the magnetic nature and other observed properties of Herbig Ae/Be stars and stars with debris disks
• Redshifted Absorption at He I 10830 as a Probe of the Accretion Geometry of T Tauri Stars
• Magnetic fields in Herbig Ae stars
• Diagnosing Mass Flows Around Herbig Ae/Be Stars Using the He I 10830 Line
• HARPS spectropolarimetry of Herbig Ae/Be stars
• Activity and Magnetic Field Structure of the Sun-Like Planet Hosting Star HD 1237
• Rotationally modulated variations and the mean longitudinal magnetic field of the Herbig Ae star HD 101412
• The prevalence of weak magnetic fields in Herbig Ae stars: The case of PDS2
• The exceptional Herbig Ae star HD101412: The first detection of resolved magnetically split lines and the presence of chemical spots in a Herbig star
• Abundances in the Herbig Ae star HD 101412: Abundance anomalies; Lambda Boo-Vega characteristics?

Cited by in corpus (8)

• Gaia DR2 study of Herbig Ae/Be stars
• The accretion rates and mechanisms of Herbig Ae/Be stars
• A Statistical Spectropolarimetric Study of Herbig Ae/Be Stars
• Herbig Stars: A Quarter Century of Progress
• The Discovery of lambda Bootis Stars -- The Southern Survey II
• NGC 6611 601: A hot pre-main sequence spectroscopic binary containing a centrifugal magnetosphere host star
• Spectroscopic study of Herbig Ae/Be stars in the Galactic Anti-center region from LAMOST DR5
• Spectropolarimetry of stars across the H-R diagram