Spectroscopy of planetary mass brown dwarfs in Orion
arXiv:astro-ph/0609086 · doi:10.1111/j.1745-3933.2006.00244.x
Abstract
We report the results of near infrared spectroscopy of 11 luminosity selected candidate planetary mass objects (PMOs) in the Trapezium Cluster with Gemini South/GNIRS and Gemini North/NIRI. 6 have spectral types >=M9, in agreement with expectations for PMOs. 2 have slightly earlier types, and 3 are much earlier types which are probably field stars. 4/6 sources with types >= M9 have pseudo-continuum profiles which confirm them as low gravity cluster members. The gravity status of the other cool dwarfs is less clear but these remain candidate PMOs. The derived number fraction of PMOs with M=3-15 Mjup is 1-14%, these broad limits reflecting the uncertainty in source ages. However, the number fraction with M<20 Mjup is at least 5%. These detections add significantly to the body of evidence that a planetary mass population is produced by the star formation process.
arXiv commentAccepted by MNRAS Letters, 5 pages, 2 figures
References in corpus (24)
- A Non-Gray Theory of Extrasolar Giant Planets and Brown Dwarfs
- Evolutionary models for very-low-mass stars and brown dwarfs with dusty atmospheres
- Evolutionary models for low-mass stars and brown dwarfs: uncertainties and limits at very young ages
- Sixty-seven Additional L Dwarfs Discovered by the Two Micron All Sky Survey (2MASS)
- A Census of the Young Cluster IC 348
- L' and M' Photometry of Ultracool Dwarfs
- Young Low-Mass Stars and Brown Dwarfs in IC 348
- A Population of very young Brown Dwarfs and free-floating Planets in Orion
- Infrared Spectroscopy of Substellar Objects in Orion
- Discovery of a Very Young Field L Dwarf, 2MASS J01415823-4633574
- Identifying Young Brown Dwarfs Using Gravity-Sensitive Spectral Features
- Spectroscopy of Brown Dwarf Candidates in the rho Ophiuchi Molecular Core
- Exploring Brown Dwarf Disks in rho Oph
- T Dwarfs and the Substellar Mass Function. I. Monte Carlo Simulations
- A Survey for Spectroscopic Binaries Among Very Low-Mass Stars
- Young, Low-Mass Brown Dwarfs with Mid-Infrared Excesses
- Discovery of a Planetary-Mass Brown Dwarf with a Circumstellar Disk
- The Spatial Distribution of Brown Dwarfs in Taurus
- Age spreads in star forming regions: The lithium test in the Orion Nebula Cluster
- Deep 3.8 micron Observations of the Trapezium Cluster
- Measuring Fundamental Parameters of Substellar Objects. II: Masses and Radii
- A deep survey of brown dwarfs in Orion with Gemini
- Spectroscopic Confirmation of the Least Massive Known Brown Dwarf in Chamaeleon
- Spectroscopy of Young Planetary Mass Candidates with Disks
Cited by in corpus (32)
- The Stellar Population of the Chamaeleon I Star-Forming Region
- The Initial Mass Function of the Orion Nebula Cluster across the H-burning limit
- The Gemini NICI Planet-Finding Campaign : Discovery of a Substellar L Dwarf Companion to the Nearby Young M Dwarf CD-35 2722
- Brown dwarfs and very low mass stars in the Hyades cluster : a dynamically evolved mass function
- Infrared Spectroscopy and Analysis of Brown Dwarf and Planetary Mass Objects in the Orion Nebula Cluster
- Substellar Objects in Nearby Young Clusters (SONYC): The bottom of the Initial Mass Function in NGC1333
- Discovery of a Young L Dwarf Binary, SDSS J224953.47+004404.6AB
- An Enhanced Spectroscopic Census of the Orion Nebula Cluster
- Near-infrared low-resolution spectroscopy of Pleiades L-type brown dwarfs
- Towards Precise Ages and Masses of Free Floating Planetary Mass Brown Dwarfs
- Close encounters involving free-floating planets in star clusters
- The dynamical fate of planetary systems in young star clusters
- The Hubble Space Telescope Treasury Program on the Orion Nebula Cluster
- A Young Planetary-Mass Object in the rho Oph Cloud Core
- Substellar Objects in Nearby Young Clusters (SONYC) III: Chamaeleon-I
- Search and characterization of T-type planetary mass candidates in the sigma Orionis cluster
- The origin of free-floating planets
- Youth analysis of near infrared spectra of young low-mass stars and brown dwarfs
- A Methane Imaging Survey for T Dwarf Candidates in Rho Ophiuchi
- An optical spectroscopic H-R diagram for low-mass stars and brown dwarfs in Orion
- Binary Formation in the Orion Nebula Cluster: Exploring the Sub-stellar Limit
- Measuring the Initial Mass Function of Low Mass Stars and Brown Dwarfs
- Euclid: Early Release Observations -- A glance at free-floating new-born planets in the sigma Orionis cluster
- Rogue planets and brown dwarfs: Predicting the populations of free-floating planetary mass objects observable with JWST
- A Method for Selecting M dwarfs with an Increased Likelihood of Unresolved Ultra-cool Companionship
- The first spectroscopically identified L dwarf in Praesepe
- The circumstellar environment of the YSO TMR-1 and a revisit to the candidate very low-mass object TMR-1C
- Do micro brown dwarf detections explain the galactic dark matter?
- Multi-Object and Long-Slit Spectroscopy of Very Low Mass Brown Dwarfs in Orion Nebular Cluster
- Discovery of a brown dwarf with quasi-spherical mass-loss
- Simulation of images of protoplanetary disks after collision with free-floating planets
- Primordial Planet Formation