scholarly journals Hubble Space Telescope astrometry of the closest brown dwarf binary system – I. Overview and improved orbit★

2017 ◽  
Vol 470 (1) ◽  
pp. 1140-1155 ◽  
Author(s):  
L. R. Bedin ◽  
D. Pourbaix ◽  
D. Apai ◽  
A. J. Burgasser ◽  
E. Buenzli ◽  
...  
Keyword(s):  
Binary System ◽  
Hubble Space Telescope ◽  
Brown Dwarf ◽  
Space Telescope

Final Hubble Space Telescope Astrometry of the Procyon Binary System

2018 ◽  
Vol 2 (3) ◽  
pp. 147 ◽  
Author(s):  
Howard E. Bond ◽  
Ronald L. Gilliland ◽  
Gail H. Schaefer ◽  
Martin A. Barstow ◽  
Pierre Demarque ◽  
...  
Keyword(s):  
Binary System ◽  
Hubble Space Telescope ◽  
Space Telescope

scholarly journals Surveying the Solar Neighborhood for Brown Dwarf Companions with the ECLIPSE Discovery Mission

2003 ◽  
Vol 211 ◽  
pp. 523-524
Author(s):  
Karl Stapelfeldt
Keyword(s):  
Luminosity Function ◽  
Hubble Space Telescope ◽  
Scattered Light ◽  
Solar Neighborhood ◽  
Brown Dwarf ◽  
Space Telescope ◽  
Effective Temperatures

The proposed Eclipse Discovery mission is an optical space telescope designed to provide a thousandfold reduction in scattered light near bright stars in comparison to any Hubble Space Telescope instrument. A survey of 500 single stars within 15 pc can detect companions with absolute z magnitude of 22 at separations > 10 AU in most of the targets. Spectrophotometry of CH4 and H2O bands between 0.8-1.0 μm can be used to derive the effective temperatures of the objects. The ECLIPSE brown dwarf survey would directly measure the luminosity function of brown dwarf companions down to ~20 Jupiter masses, providing a crucial comparison with field objects.

scholarly journals VERTICAL ATMOSPHERIC STRUCTURE IN A VARIABLE BROWN DWARF: PRESSURE-DEPENDENT PHASE SHIFTS IN SIMULTANEOUS HUBBLE SPACE TELESCOPE - SPITZER LIGHT CURVES

2012 ◽  
Vol 760 (2) ◽  
pp. L31 ◽  
Author(s):  
Esther Buenzli ◽  
Dániel Apai ◽  
Caroline V. Morley ◽  
Davin Flateau ◽  
Adam P. Showman ◽  
...  
Keyword(s):  
Hubble Space Telescope ◽  
Phase Shifts ◽  
Light Curves ◽  
Brown Dwarf ◽  
Space Telescope ◽  
Atmospheric Structure

scholarly journals The Y dwarf population with HST: unlocking the secrets of our coolest neighbours – I. Overview and first astrometric results

2020 ◽  
Vol 501 (1) ◽  
pp. 911-915
Author(s):  
C Fontanive ◽  
L R Bedin ◽  
D C Bardalez Gagliuffi
Keyword(s):  
Proper Motion ◽  
Hubble Space Telescope ◽  
Proper Motions ◽  
Brown Dwarf ◽  
Space Telescope ◽  
First Results

ABSTRACT In this paper, we present our project that aims at determining accurate distances and proper motions for the Y brown dwarf population using the Hubble Space Telescope. We validate the program with our first results, using a single new epoch of observations of the Y0pec dwarf WISE J163940.83−684738.6. These new data allowed us to refine its proper motion and improve the accuracy of its parallax by a factor of three compared to previous determinations, now constrained to ϖ = 211.11 ± 0.56 mas. This newly derived absolute parallax corresponds to a distance of 4.737 ± 0.013 pc, an exquisite and unprecedented precision for faint ultracool Y dwarfs.

scholarly journals Hubble Space Telescope NICMOS Observations of T Dwarfs: Brown Dwarf Multiplicity and New Probes of the L/T Transition

2006 ◽  
Vol 166 (2) ◽  
pp. 585-612 ◽  
Author(s):  
Adam J. Burgasser ◽  
J. Davy Kirkpatrick ◽  
Kelle L. Cruz ◽  
I. Neill Reid ◽  
Sandy K. Leggett ◽  
...  
Keyword(s):  
Hubble Space Telescope ◽  
Brown Dwarf ◽  
Space Telescope

scholarly journals THE COLLAPSE OF THE WIEN TAIL IN THE COLDEST BROWN DWARF? HUBBLE SPACE TELESCOPE NEAR-INFRARED PHOTOMETRY OF WISE J085510.83–071442.5

2016 ◽  
Vol 823 (2) ◽  
pp. L35 ◽  
Author(s):  
Adam C. Schneider ◽  
Michael C. Cushing ◽  
J. Davy Kirkpatrick ◽  
Christopher R. Gelino
Keyword(s):  
Near Infrared ◽  
Hubble Space Telescope ◽  
Infrared Photometry ◽  
Brown Dwarf ◽  
Space Telescope

First [ITAL]Hubble Space Telescope[/ITAL] Observations of Mira AB Wind-accreting Binary System

1997 ◽  
Vol 482 (2) ◽  
pp. L175-L178 ◽  
Author(s):  
Margarita Karovska ◽  
Warren Hack ◽  
John Raymond ◽  
Edward Guinan
Keyword(s):  
Binary System ◽  
Hubble Space Telescope ◽  
Space Telescope

Hubble Space Telescope/Faint Object Spectrograph Imaging of Wolf 424 AB: Is This Binary a Double Brown Dwarf System?

1998 ◽  
Vol 110 (743) ◽  
pp. 31-38 ◽  
Author(s):  
A. B. Schultz ◽  
H. M. Hart ◽  
J. L. Hershey ◽  
F. C. Hamilton ◽  
M. Kochte ◽  
...  
Keyword(s):  
Hubble Space Telescope ◽  
Brown Dwarf ◽  
Space Telescope ◽  
Faint Object ◽  
Faint Object Spectrograph

scholarly journals Unseen companions of V Hya inferred from periodic ejections

2019 ◽  
Vol 487 (3) ◽  
pp. 3029-3036 ◽  
Author(s):  
Jesus M Salas ◽  
Smadar Naoz ◽  
Mark R Morris ◽  
Alexander P Stephan
Keyword(s):  
Orbital Period ◽  
Triple System ◽  
High Speed ◽  
Hubble Space Telescope ◽  
Eccentric Orbit ◽  
Brown Dwarf ◽  
High Eccentricity ◽  
Distant Object ◽  
Space Telescope ◽  
Ejection Mechanism

ABSTRACT A recent study using Hubble Space Telescope observations found periodic, high-speed, collimated ejections (or ‘bullets’) from the star V Hya. The authors of that study proposed a model associating these bullets with the periastron passage of an unseen, substellar companion in an eccentric orbit and with an orbital period of ∼8 yr. Here we propose that V Hya is part of a triple system, with a substellar companion having an orbital period of ∼8 yr, and a tertiary object on a much wider orbit. In this model, the more distant object causes high-eccentricity excitations on the substellar companion’s orbit via the Eccentric Kozai–Lidov mechanism. These eccentricities can reach such high values that they lead to Roche-lobe crossing, producing the observed bullet ejections via a strongly enhanced accretion episode. For example, we find that a ballistic bullet ejection mechanism can be produced by a brown-dwarf-mass companion, while magnetically driven outflows are consistent with a Jovian-mass companion. Finally, we suggest that the distant companion may reside at few a hundred astronomical units on an eccentric orbit.

scholarly journals Extending Gaia  DR2 with HST  narrow-field astrometry – II. Refining the method on WISE J163940.83−684738.6★

2020 ◽  
Vol 494 (2) ◽  
pp. 2068-2075
Author(s):  
L R Bedin ◽  
C Fontanive
Keyword(s):  
High Precision ◽  
Reference System ◽  
Hubble Space Telescope ◽  
High Accuracy ◽  
Test Case ◽  
Wide Field ◽  
Brown Dwarf ◽  
Space Telescope ◽  
Infra Red ◽  
Gaia Dr2

ABSTRACT In the second paper of this series, we perfected our method of linking high-precision Hubble Space Telescope astrometry to the high-accuracy Gaia DR2 absolute reference system to overcome the limitations of relative astrometry with narrow-field cameras. Our test case here is the Y brown dwarf WISE  J163940.83−684738.6, observed at different epochs spread over a 6-yr time baseline with the Infra-Red channel of the Wide Field Camera 3. We derived significantly improved astrometric parameters compared to previous determinations, finding (μαcos δ, μδ, ϖ) = (577.21 ± 0.24 mas yr−1, −3108.39 ± 0.27 mas yr−1, 210.4 ± 1.8 mas). In particular, our derived absolute parallax (ϖ ) corresponds to a distance of 4.75 ± 0.05 pc for the faint ultracool dwarf.

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