AB Aurigae

AB Aurigae
Name	AB Aurigae
Constellation	Auriga
Epoch	J2000
Ra	04h 55m 45.8s
Dec	+30° 33′ 04″
Apparent mag	7.05
Spectral type	A0e–A1e
Distance	~162 pc
Mass	~2.4 M⊙
Radius	~2.5 R⊙
Age	~2–4 Myr

AB Aurigae is a young Herbig Ae star located in the constellation Auriga, notable for its nearby protoplanetary disk that exhibits complex spiral structure. The star has been a focus of studies of early stellar evolution, disk dynamics, and planet formation, attracting observations from instruments associated with institutions such as European Southern Observatory, National Radio Astronomy Observatory, and missions like Hubble Space Telescope and Atacama Large Millimeter/submillimeter Array. Research on the object intersects work by teams from Harvard-Smithsonian Center for Astrophysics, Max Planck Institute for Astronomy, and California Institute of Technology.

Introduction

AB Aurigae sits within the Taurus-Auriga molecular cloud complex region and is often compared with other Herbig Ae/Be stars such as HD 163296, MWC 480, and HD 100546. Its proximity has made it accessible to facilities including Subaru Telescope, Keck Observatory, and Very Large Telescope, enabling multiwavelength campaigns alongside surveys like Spitzer Space Telescope legacy programs and WISE catalogs. The object has served as a test case for theoretical models developed at institutions like Institute for Advanced Study and by researchers associated with University of Cambridge and Princeton University.

Stellar characteristics

The central star is classified around spectral type A0–A1 with emission lines, placing it among pre-main-sequence objects studied by researchers at University of Toronto and University of Arizona. Measurements of luminosity and effective temperature tie into evolutionary tracks computed by groups at Geneva Observatory and Yale University stellar evolution codes. Stellar mass estimates derive from comparisons to models from Padova Observatory and inputs used in simulations at Jet Propulsion Laboratory. Rotation and magnetic activity investigations reference work from Max Planck Institute for Solar System Research and studies published via Royal Astronomical Society journals. Age determinations referencing isochrones involve collaborations with teams at University of Chicago and University of California, Berkeley.

Circumstellar disk and planet formation

The circumstellar disk around the star displays multiple spiral arms, rings, and gaps revealed by high-resolution imaging from ALMA, Hubble Space Telescope, and adaptive optics systems at Gemini Observatory. Disk morphology has been interpreted using hydrodynamic models developed by researchers at University of Oxford and University of California, Santa Cruz, invoking processes such as gravitational instability and planet–disk interactions proposed in works from Institute for Astronomy, University of Hawaii and University of Exeter. Dust and gas chemistry analyses cite laboratory spectroscopy collaborations at Max Planck Institute for Extraterrestrial Physics and NASA Ames Research Center. Proposed protoplanet candidates and vortex features have been examined in context with planet formation theories advanced by University of Cambridge and ETH Zurich groups, and compared with exoplanet detections from Kepler and imaging campaigns by European Southern Observatory teams.

Observational history and techniques

Observations span optical, infrared, millimeter, and radio wavelengths, utilizing instruments such as Herschel Space Observatory, Spitzer Space Telescope, SOFIA, and interferometers like Very Large Telescope Interferometer and CHARA Array. Early spectral classifications trace back to surveys coordinated by Copenhagen University Observatory and catalogs compiled at Smithsonian Astrophysical Observatory. Polarimetric imaging executed at Subaru Telescope and coronagraphic observations from Palomar Observatory have been essential for isolating scattered light features, complementing spectroscopic campaigns run at Keck Observatory and Large Binocular Telescope. Data reduction and modeling techniques reference software development efforts at Space Telescope Science Institute and algorithmic advances from Carnegie Observatories.

Variability and spectral features

The star shows emission-line variability and photometric changes that have been monitored by networks like American Association of Variable Star Observers and professional programs at Royal Observatory Edinburgh. Spectral features include hydrogen recombination lines and forbidden lines analyzed in studies affiliated with Max Planck Institute for Astronomy and published through Monthly Notices of the Royal Astronomical Society and The Astrophysical Journal. Time-series spectroscopy linking accretion variability and inner-disk dynamics engages theoretical work from University of Toronto and magnetospheric accretion models advanced at University of St Andrews.

Surrounding environment and companions

AB Aurigae resides in a star-forming environment with nearby young stellar objects cataloged in surveys by 2MASS and Gaia mission releases processed by European Space Agency. Searches for stellar and substellar companions have employed adaptive optics from Keck Observatory and aperture-masking interferometry at Palomar Observatory, with candidate companions discussed in the context of multiplicity statistics compiled by teams at University of Cambridge and Max Planck Institute for Astronomy. The local interstellar and natal cloud conditions have been characterized using molecular-line maps from NRAO and chemical models developed at Leiden Observatory.

Category:Herbig Ae/Be stars Category:Protoplanetary disks Category:Auriga (constellation)