An unusually large gaseous transit in a debris disc
arXiv:1910.04747 · doi:10.1093/mnras/stz2888
Abstract
We present the detection of an unusually large transient gas absorption in several ionized species in the debris disc star HD 37306 using high-resolution optical spectra. We have been analysing a large sample of debris discs searching for circumstellar gas absorptions aiming to determine the frequency of gas in debris discs. HD 37306 stood out showing remarkably broad absorptions superimposed onto several photospheric Ca ii, Fe ii and Ti ii lines. The observed absorptions, unlike typical exocometary transits, lasted for at least eight days. Here we analyse simultaneous spectroscopic and photometric data of the event and evaluate different scenarios that might explain the observed features. We conclude that the most likely scenario might be an exocometary break-up releasing a significant amount of gas close to the star, producing an occulting "ring"/"torus" shape.
arXiv comment11 pages, 10 figures, accepted in MNRAS
References in corpus (52)
- Astropy: A Community Python Package for Astronomy
- emcee: The MCMC Hammer
- The Transiting Exoplanet Survey Satellite
- MultiNest: an efficient and robust Bayesian inference tool for cosmology and particle physics
- Intrinsic Colors, Temperatures, and Bolometric Corrections of Pre-Main Sequence Stars
- A new extensive library of PHOENIX stellar atmospheres and synthetic spectra
- The Man Behind the Curtain: X-rays Drive the UV through NIR Variability in the 2013 AGN Outburst in NGC 2617
- The All-Sky Automated Survey for Supernovae (ASAS-SN) Light Curve Server v1.0
- SparsePak: A Formatted Fiber Field Unit for The WIYN Telescope Bench Spectrograph. I. Design, Construction, and Calibration
- Kepler Presearch Data Conditioning II - A Bayesian Approach to Systematic Error Correction
- Angular Differential Imaging: a Powerful High-Contrast Imaging Technique
- Kepler Presearch Data Conditioning I - Architecture and Algorithms for Error Correction in Kepler Light Curves
- Molecfit: A general tool for telluric absorption correction. I. Method and application to ESO instruments
- Optimal Techniques in Two-dimensional Spectroscopy: Background Subtraction for the 21st Century
- Overview of the Kepler Science Processing Pipeline
- VOSA: Virtual Observatory SED Analyzer. An application to the Collinder 69 open cluster
- BANYAN. XI. The BANYAN multivariate Bayesian algorithm to identify members of young associations within 150 pc
- Molecfit: A general tool for telluric absorption correction II. Quantitative evaluation on ESO-VLT X-Shooter spectra
- The Gemini Planet Imager Exoplanet Survey: Giant Planet and Brown Dwarf Demographics From 10-100 AU
- The VAST Survey - III. The multiplicity of A-type stars within 75 pc
- Pulkovo Compilation of Radial Velocities for 35495 Hipparcos Stars in a Common System
- Characterization of exoplanets from their formation I: Models of combined planet formation and evolution
- Photometric characterization of exoplanets using angular and spectral differential imaging
- Planet Hunters X. KIC 8462852 - Where's the Flux?
- VIP: Vortex Image Processing package for high-contrast direct imaging
- Impact of angular differential imaging on circumstellar disk images
- A 40 Myr Old Gaseous Circumstellar Disk at 49 Ceti: Massive CO-Rich Comet Clouds at Young A-Type Stars
- Type I planetary migration in a self-gravitating disk
- Standing on the shoulders of giants: Trojan Earths and vortex trapping in low mass self-gravitating protoplanetary disks of gas and solids
- The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets
- Predictions for the secondary CO, C and O gas content of debris discs from the destruction of volatile-rich planetesimals
- The Evolution of Early-Type Galaxies in Distant Clusters III.: M/L_V Ratios in the z=0.33 Cluster CL1358+62
- ALMA observations of the molecular gas in the debris disk of the 30 Myr old star HD 21997
- A Trend Between Cold Debris Disk Temperature and Stellar Type: Implications for the Formation and Evolution of Wide-Orbit Planets
- Exocomets in the circumstellar gas disk of HD 172555
- Transiting exocomets detected in broadband light by TESS in the Pictoris system
- Stirring in massive, young debris discs from spatially resolved Herschel images
- The Multi-site All-Sky CAmeRA: Finding transiting exoplanets around bright () stars
- Post conjunction detection of Pictoris b with VLT/SPHERE
- Early-type stars observed in the ESO UVES Paranal Observatory Project: I -- Interstellar Na I UV, Ti II and Ca II K observations
- Modelling the KIC8462852 light curves: compatibility of the dips and secular dimming with an exocomet interpretation
- The co-existence of hot and cold gas in debris discs
- Protoplanetary disks including radiative feedback from accreting planets
- Validation of small Kepler transiting planet candidates in or near the habitable zone
- Debris disks with multiple absorption features in metallic lines: circumstellar or interstellar origin?
- Small-scale structure in the interstellar medium: time-varying interstellar absorption towards κ Velorum
- Dusty spirals triggered by shadows in transition discs
- Spatial Distribution and Kinematics of OB Stars
- On the evolutionary state of massive stars in transition phases in M33
- Optical spectroscopy of the blue supergiant Sk-69 279 and its circumstellar shell with SALT
- Early-type stars observed in the ESO UVES Paranal Observatory Project - V. Time-variable interstellar absorption
- Data calibration for the MASCARA and bRing instruments