Deep L' and M-band Imaging for Planets Around Vega and epsilon Eridani

Abstract

We have obtained deep Adaptive Optics (AO) images of Vega and epsilon Eri to search for planetary-mass companions. We observed at the MMT in the L' (3.8 micron) and M (4.8 micron) bands using Clio, a recently commissioned imager optimized for these wavelengths. Observing at these long wavelengths represents a departure from the H band (1.65 microns) more commonly used for AO imaging searches for extrasolar planets. The long wavelengths offer better predicted planet/star flux ratios and cleaner (higher Strehl) AO images, at the cost of lower diffraction limited resolution and higher sky background. We have not detected any planets or planet candidates around Vega or epsilon Eri. We report the sensitivities obtained around both stars, which correspond to upper limits on any planetary companions which may exist. The sensitivities of our L' and M band observations are comparable to those of the best H-regime observations of these stars. For epsilon Eri our M band observations deliver considerably better sensitivity to close-in planets than any previously published results, and we show that the M band is by far the best wavelength choice for attempts at ground-based AO imaging of the known planet epsilon Eri b. The Clio camera itself with MMTAO may be capable of detecting epsilon Eri b at its 2010 apastron, given a multi-night observing campaign. Clio appears to be the only currently existing AO imager that has a realistic possibility of detecting epsilon Eri b.

arXiv comment45 pages, 15 figures, accepted to ApJ

References in corpus (25)

• Evolutionary models for cool brown dwarfs and extrasolar giant planets. The case of HD 20945
• Angular Differential Imaging: a Powerful High-Contrast Imaging Technique
• On the Luminosity of Young Jupiters
• A dust ring around Epsilon Eridani: analogue to the young Solar System
• The Gemini Deep Planet Survey -- GDPS
• Beyond the T Dwarfs: Theoretical Spectra, Colors, and Detectability of the Coolest Brown Dwarfs
• Evidence for a Long-period Planet Orbiting Epsilon Eridani
• Resonant Trapping of Planetesimals by Planet Migration: Debris Disk Clumps and Vega's Similarity to the Solar System
• The Extrasolar Planet epsilon Eridani b - Orbit and Mass
• A search for hot massive extrasolar planets around nearby young stars with the adaptive optics system NACO
• A Systematic Study of Departures from Chemical Equilibrium in the Atmospheres of Substellar Mass Objects
• Structure in the Epislon Eridani dusty disk caused by mean motion resonances with a 0.3 eccentricity planet at periastron
• Temporal Evolution of Coronagraphic Dynamic Range, and Constraints on Companions to Vega
• 3.6-7.9 um Photometry of L and T Dwarfs and the Prevalence of Vertical Mixing in their Atmospheres
• Ages of A-type Vega-like stars from uvby$\beta$ Photometry
• L' and M' Standard Stars for the Mauna Kea Observatories Near-Infrared System
• Numerical Modelling of Dusty Debris Disks
• First On-Sky High Contrast Imaging with an Apodizing Phase Plate
• Modeling the Infrared Emission from the HR 4796A Disk
• Thermal Infrared Constraint to a Planetary Companion of Vega with the MMT Adaptive Optics System
• NACO-SDI direct imaging search for the exoplanet Eps Eri b
• Images of Vega Dust Ring at 350 and 450 microns: New Clues to the Trapping of Multiple-Sized Dust Particles in Planetary Resonances
• 5-micron photometry of late-type dwarfs
• Coronagraphic Search for Extra-Solar Planets around epsilon Eri and Vega
• A direct and differential imaging search for sub-stellar companions to epsilon Indi A

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• The HARPS-TERRA project I. Description of the algorithms, performance and new measurements on a few remarkable stars observed by HARPS
• Imaging Extrasolar Giant Planets
• Constraints on Long-Period Planets from an L' and M band Survey of Nearby Sun-Like Stars: Observations
• Constraints on Long-Period Planets from an L' and M band Survey of Nearby Sun-Like Stars: Modeling Results
• Discovery of a Faint Companion to Alcor Using MMT/AO 5 $\mu$m Imaging
• Asteroid Belts in Debris Disk Twins: VEGA and FOMALHAUT
• First Light LBT AO Images of HR 8799 bcde at 1.65 and 3.3 Microns: New Discrepancies between Young Planets and Old Brown Dwarfs
• The SEEDS Direct Imaging Survey for Planets and Scattered Dust Emission in Debris Disk Systems
• Spitzer/IRAC Limits to Planetary Companions of Fomalhaut and epsilon Eridani
• The Northern Arc of $\epsilon$ Eridani's Debris Ring as Seen by ALMA
• Vega's hot dust from icy planetesimals scattered inward by an outward-migrating planetary system
• High-contrast Imaging with Spitzer: Deep Observations of Vega, Fomalhaut, and epsilon Eridani
• Optimized Principal Component Analysis on Coronagraphic Images of the Fomalhaut System
• On the Emergent Spectra of Hot Protoplanet Collision Afterglows
• Direct Imaging Constraints on the Putative Exoplanet 14 Her c
• Discovery and Characterization of a Faint Stellar Companion to the A3V Star Zeta Virginis
• The Lyot Project Direct Imaging Survey of Substellar Companions: Statistical Analysis and Information from Nondetections
• Dust Populations in the Iconic Vega Planetary System Resolved by ALMA
• Extrasolar comets : the origin of dust in exozodiacal disks?
• Clearing residual planetesimals by sweeping secular resonances in transitional disks: a lone-planet scenario for the wide gaps in debris disks around Vega and Fomalhaut
• On-Sky Demonstration of a Linear Band-limited Mask with Application to Visual Binary Stars
• A decade of radial-velocity monitoring of Vega and new limits on the presence of planets
• A deep search for planets in the inner 15 au around Vega
• Searching for Planets Orbiting Vega with the James Webb Space Telescope
• Planet Search with the Keck/NIRC2 Vortex Coronagraph in Ms-band for Vega
• Radial velocity analysis of stars with debris discs
• Searching for Planets around Altair with JWST/NIRcam