* Astronomy

Title: Discovery of Two Nearby, Peculiar L Dwarfs from the 2MASS Proper Motion Survey: Young or Metal-Rich? Authors: Dagny L. Looper (1), J. Davy Kirkpatrick (2), Roc M. Cutri (2), Travis Barman (3), Adam J. Burgasser (4), Michael C. Cushing (1,5), Thomas Roellig (6), Mark R. McGovern (7),...

After decades of searching, astronomers discovered the first definite brown dwarf only ten years ago. Now, a new analysis of Hubble Space Telescope data implies our Galaxy has almost as many of these failed stars as it does normal stars like the Sun. The Sun and most other stars power themselves by...

Title: A Catalogue of Spectroscopically Confirmed White Dwarfs from the Sloan Digital Sky Survey Data Release 4 Authors: Daniel J. Eisenstein, James Liebert, Hugh C. Harris, S.J. Kleinmann, Atsuko Nitta, Nicole Silvestri, Scott A. Anderson, J.C. Barentine, Howard J. Brewin...

COMBO-17 J114356.08-0144032 Christian Wolf of the University of Oxford has discovered a rare Ultra-cool white dwarf. Only seven of these ultra cool white dwarfs, with surface temperatures below 4,000 kelvins, were known to exist before. Regular white dwarfs are dead star...

Title: White Dwarf - Red Dwarf Systems Resolved with the Hubble Space Telescope: I. First Results Authors: J. Farihi, D.W. Hoard, S. Wachter First results are presented for a Hubble Space Telescope Advanced Camera for Surveys snapshot study of white dwarfs with likely red d...

Astronomers have discovered white dwarf stars with pure carbon atmospheres. These stars possibly evolved in a sequence astronomers didn't know before. They may have evolved from stars that are not quite massive enough to explode as supernovae but are just on the borderline. All but the most massi...

Title: Identification of New M Dwarfs in the Solar Neighbourhood Authors: Basmah Riaz, John E. Gizis, James Harvin Researchers present the results from a spectroscopic study of 1080 nearby active M dwarfs, selected by correlating the 2MASS and ROSAT catalogues. They have...

Title: Spitzer Observations of two TW Hydrae Association Brown Dwarfs Authors: Basmah Riaz, John E. Gizis, Abraham Hmiel Researchers present Spitzer Space Telescope observations of two TW Hydrae Association brown dwarfs, 2MASSW J1207334-393254 and 2MASSW J1139511-3...

Title: Two T dwarfs from the UKIDSS Early Data Release Authors: T. R. Kendall, M. Tamura, C. G. Tinney, E. L. Martin, M. Ishii, D. J. Pinfield, P. W. Lucas, H. R. A. Jones, S. K. Leggett, S. Dye, P. C. Hewett, F. Allard, I. Baraffe, D. Barrado y Navascues, G. Carraro, S. L. Casewell, G. Chabrier, R. J. Chapp...

Title: Hot DB White Dwarfs from the Sloan Digital Sky Survey Authors: Daniel J. Eisenstein, James Liebert, Detlev Koester, S.J. Kleinmann, Atsuko Nitta, Paul S. Smith, J.C. Barentine, Howard J. Brewington, J. Brinkmann, Michael Harvanek, Jurek Krzesinski, Eric H. Neilsen Jr...

Astronomers have glimpsed dusty debris around an essentially dead star where gravity and radiation should have long ago removed any sign of dust. The discovery might provide insights into our own solar system’s eventual demise several billion years from now. Solar systems may continue to exis...

The universe's best real estate for life may be around stars a little less massive than the sun, called orange dwarfs, according to a new analysis. These stars live much longer than sun-like stars, and have safer habitable zones - where liquid water can exist - than those of lighter red dwarf stars. St...

Twenty-four unusual stars, 18 of them newly discovered, have been observed in new Hubble telescope images. The stars are white dwarfs, a common type of dead star, but they are odd because they are made of helium rather than the usual carbon and oxygen. This is the first extensive sequence of helium-c...

Title: Uncovering the Outflow Driven by the Brown Dwarf LS-RCr A1: H-alpha as a Tracer of Outflow Activity in Brown Dwarfs Authors: E.T. Whelan, T.P. Ray, F. Bacciotti It is now apparent that classical T Tauri-like outflows commonly accompany the formation of young brown dwarfs. To date two optica...

Title: Kelu-1 is a Binary L Dwarf: First Brown Dwarf Science from Laser Guide Star Adaptive Optics Authors: Michael C. Liu (IfA/Hawaii), Sandy K. Leggett (UKIRT/JAC) Researchers have presented near-IR imaging of the nearby L2 dwarf Kelu-1 obtained with the Keck...

Title: A Far Ultraviolet Archival Study of Cataclysmic Variables: I. FUSE and HST/STIS Spectra of the Exposed White Dwarf in Dwarf Nova Systems Authors: P. Godon, E.M. Sion, P.E. Barrett, I. Hubeny, A.P. Linnell, P. Szkody We present a synthetic spectral analysis of Far Ultraviolet Spectroscopi...

Title: HST search for M subdwarf binaries Authors: Basmah Riaz, John E. Gizis, Debasmita Samaddar We present HST/ACS observations of 19 nearby M subdwarfs in a search for binary systems. Other than the wide common proper motion pair LHS 2140/2139, none of our sdM and esdM targets are found to be bina...

Title: Studying the Physical Diversity of Late-M Dwarfs with Dynamical Masses Authors: Trent Dupuy, Michael Liu, Brendan Bowler, Michael Cushing, Christiane Helling, Soeren Witte, Peter Hauschildt We present a systematic study of the physical properties of late-M dwarfs based on high-quali...

NASA's Wise Mission Discovers Coolest Class of Stars Scientists using data from NASA's Wide-field Infrared Survey Explorer (WISE) have discovered the coldest class of star-like bodies, with temperatures as cool as the human body. Astronomers hunted these dark orbs, termed Y dwarfs, for more th...

Title: Maximum Reduced Proper Motion Method: Detection of New Nearby Ultracool Dwarfs Authors: N. Phan-Bao (HCMIU, Vietnam National University) In this paper, we describe how to use the Maximum Reduced Proper Motion method (Phan-Bao et al. 2003) to detect 57 nearby L and late-M dwarfs (d_phot &l...

It looks like we have a new neighbour. It's actually been there all along, but astronomers have only now spotted what could be the seventh closest star system to the sun. The system is just nine light years away, a mere stone's throw in astronomical terms. It took so long to find because it's an extremel...

The Coldest Brown Dwarf Catalogued as WISE 1828+2650, this brown dwarf lies within 40 light-years of the Sun and is currently the coldest brown dwarf known. Brown dwarfs are roughly the size of the planet Jupiter. WISE 1828+2650, assigned to spectral class Y, has the estimated temperature of a war...

Title: WISEP J180026.60+013453.1: A Nearby Late L Dwarf Near the Galactic Plane Authors: John E. Gizis, Adam J. Burgasser, Jacqueline K. Faherty, Philip J. Castro, Michael M. Shara We report a nearby L7.5 dwarf discovered using the Preliminary Data Release of the Wide-field Infrared Survey Expl...

	Forum	Replies	Views	Last Post
Dwarf L Dwarfs (Preview)	Stars/galaxy News	0	1332	Jun 9 12:18 2008 by Blobrana
Title: Discovery of Two Nearby, Peculiar L Dwarfs from the 2MASS Proper Motion Survey: Young or Metal-Rich? Authors: Dagny L. Looper (1), J. Davy Kirkpatrick (2), Roc M. Cutri (2), Travis Barman (3), Adam J. Burgasser (4), Michael C. Cushing (1,5), Thomas Roellig (6), Mark R. McGovern (7),...
Brown Dwarf Dwarf M dwarf Brown Dwarfs ( 1 2 3 4 5 … 8 ) (Preview)	Stars/galaxy News	71	36854	Jun 6 10:08 2017 by Blobrana
After decades of searching, astronomers discovered the first definite brown dwarf only ten years ago. Now, a new analysis of Hubble Space Telescope data implies our Galaxy has almost as many of these failed stars as it does normal stars like the Sun. The Sun and most other stars power themselves by...
White Dwarf Dwarf White Dwarfs ( 1 2 3 4 5 ) (Preview)	Stars/galaxy News	47	28194	May 23 01:50 2013 by Blobrana
Title: A Catalogue of Spectroscopically Confirmed White Dwarfs from the Sloan Digital Sky Survey Data Release 4 Authors: Daniel J. Eisenstein, James Liebert, Hugh C. Harris, S.J. Kleinmann, Atsuko Nitta, Nicole Silvestri, Scott A. Anderson, J.C. Barentine, Howard J. Brewin...
White Dwarf Dwarf UltraCool White Dwarf ( 1 2 ) (Preview)	Stars/galaxy News	12	9937	Nov 20 00:41 2015 by Blobrana
COMBO-17 J114356.08-0144032 Christian Wolf of the University of Oxford has discovered a rare Ultra-cool white dwarf. Only seven of these ultra cool white dwarfs, with surface temperatures below 4,000 kelvins, were known to exist before. Regular white dwarfs are dead star...
White Dwarf Dwarf White / Red Dwarf Systems (Preview)	Stars/galaxy News	4	3895	Jan 22 14:57 2007 by Blobrana
Title: White Dwarf - Red Dwarf Systems Resolved with the Hubble Space Telescope: I. First Results Authors: J. Farihi, D.W. Hoard, S. Wachter First results are presented for a Hubble Space Telescope Advanced Camera for Surveys snapshot study of white dwarfs with likely red d...
White Dwarf Dwarf carbon-dominated white dwarf stars ( 1 2 ) (Preview)	Stars/galaxy News	11	9625	Oct 3 14:00 2012 by Blobrana
Astronomers have discovered white dwarf stars with pure carbon atmospheres. These stars possibly evolved in a sequence astronomers didn't know before. They may have evolved from stars that are not quite massive enough to explode as supernovae but are just on the borderline. All but the most massi...
Dwarf Red Dwarfs ( 1 2 ) (Preview)	Stars/galaxy News	11	6152	Jun 6 17:22 2017 by Blobrana
Title: Identification of New M Dwarfs in the Solar Neighbourhood Authors: Basmah Riaz, John E. Gizis, James Harvin Researchers present the results from a spectroscopic study of 1080 nearby active M dwarfs, selected by correlating the 2MASS and ROSAT catalogues. They have...
Brown Dwarf Dwarf Two TW Hydrae Association Brown Dwarfs (Preview)	Stars/galaxy News	5	4392	May 9 09:15 2008 by Blobrana
Title: Spitzer Observations of two TW Hydrae Association Brown Dwarfs Authors: Basmah Riaz, John E. Gizis, Abraham Hmiel Researchers present Spitzer Space Telescope observations of two TW Hydrae Association brown dwarfs, 2MASSW J1207334-393254 and 2MASSW J1139511-3...
Dwarf T Dwarf T dwarfs ( 1 2 ) (Preview)	Stars/galaxy News	12	6899	Mar 24 09:20 2013 by Blobrana
Title: Two T dwarfs from the UKIDSS Early Data Release Authors: T. R. Kendall, M. Tamura, C. G. Tinney, E. L. Martin, M. Ishii, D. J. Pinfield, P. W. Lucas, H. R. A. Jones, S. K. Leggett, S. Dye, P. C. Hewett, F. Allard, I. Baraffe, D. Barrado y Navascues, G. Carraro, S. L. Casewell, G. Chabrier, R. J. Chapp...
White Dwarf Dwarf Hot DB White Dwarfs (Preview)	Stars/galaxy News	3	2768	Sep 27 09:31 2012 by Blobrana
Title: Hot DB White Dwarfs from the Sloan Digital Sky Survey Authors: Daniel J. Eisenstein, James Liebert, Detlev Koester, S.J. Kleinmann, Atsuko Nitta, Paul S. Smith, J.C. Barentine, Howard J. Brewington, J. Brinkmann, Michael Harvanek, Jurek Krzesinski, Eric H. Neilsen Jr...
White Dwarf Dwarf White Dwarf GD 362 (Preview)	Stars/galaxy News	7	3979	Jan 18 18:24 2010 by Blobrana
Astronomers have glimpsed dusty debris around an essentially dead star where gravity and radiation should have long ago removed any sign of dust. The discovery might provide insights into our own solar system’s eventual demise several billion years from now. Solar systems may continue to exis...
Dwarf Orange dwarfs (Preview)	Stars/galaxy News	0	1440	May 7 17:03 2009 by Blobrana
The universe's best real estate for life may be around stars a little less massive than the sun, called orange dwarfs, according to a new analysis. These stars live much longer than sun-like stars, and have safer habitable zones - where liquid water can exist - than those of lighter red dwarf stars. St...
Dwarf Helium-core white dwarfs (Preview)	Stars/galaxy News	2	1703	Apr 26 09:23 2009 by Blobrana
Twenty-four unusual stars, 18 of them newly discovered, have been observed in new Hubble telescope images. The stars are white dwarfs, a common type of dead star, but they are odd because they are made of helium rather than the usual carbon and oxygen. This is the first extensive sequence of helium-c...
Dwarf Brown Dwarf LS-RCr A1 (Preview)	Stars/galaxy News	0	1556	Jan 6 13:05 2009 by Blobrana
Title: Uncovering the Outflow Driven by the Brown Dwarf LS-RCr A1: H-alpha as a Tracer of Outflow Activity in Brown Dwarfs Authors: E.T. Whelan, T.P. Ray, F. Bacciotti It is now apparent that classical T Tauri-like outflows commonly accompany the formation of young brown dwarfs. To date two optica...
Dwarf Kelu-1 (Preview)	Stars/galaxy News	2	3932	Nov 5 17:17 2008 by Blobrana
Title: Kelu-1 is a Binary L Dwarf: First Brown Dwarf Science from Laser Guide Star Adaptive Optics Authors: Michael C. Liu (IfA/Hawaii), Sandy K. Leggett (UKIRT/JAC) Researchers have presented near-IR imaging of the nearby L2 dwarf Kelu-1 obtained with the Keck...
Dwarf Dwarf Nova Systems (Preview)	Stars/galaxy News	0	1559	Feb 15 07:43 2008 by Blobrana
Title: A Far Ultraviolet Archival Study of Cataclysmic Variables: I. FUSE and HST/STIS Spectra of the Exposed White Dwarf in Dwarf Nova Systems Authors: P. Godon, E.M. Sion, P.E. Barrett, I. Hubeny, A.P. Linnell, P. Szkody We present a synthetic spectral analysis of Far Ultraviolet Spectroscopi...
Dwarf M subdwarf binaries (Preview)	Stars/galaxy News	0	1396	Sep 27 07:13 2007 by Blobrana
Title: HST search for M subdwarf binaries Authors: Basmah Riaz, John E. Gizis, Debasmita Samaddar We present HST/ACS observations of 19 nearby M subdwarfs in a search for binary systems. Other than the wide common proper motion pair LHS 2140/2139, none of our sdM and esdM targets are found to be bina...
Dwarf Late-M Dwarfs (Preview)	Stars	0	1214	Jul 27 11:08 2010 by Blobrana
Title: Studying the Physical Diversity of Late-M Dwarfs with Dynamical Masses Authors: Trent Dupuy, Michael Liu, Brendan Bowler, Michael Cushing, Christiane Helling, Soeren Witte, Peter Hauschildt We present a systematic study of the physical properties of late-M dwarfs based on high-quali...
Dwarf Y dwarfs (Preview)	Stars/galaxy News	3	1788	May 11 21:39 2012 by Blobrana
NASA's Wise Mission Discovers Coolest Class of Stars Scientists using data from NASA's Wide-field Infrared Survey Explorer (WISE) have discovered the coldest class of star-like bodies, with temperatures as cool as the human body. Astronomers hunted these dark orbs, termed Y dwarfs, for more th...
Dwarf Ultracool Dwarfs (Preview)	Stars	2	1929	Apr 20 19:39 2015 by Blobrana
Title: Maximum Reduced Proper Motion Method: Detection of New Nearby Ultracool Dwarfs Authors: N. Phan-Bao (HCMIU, Vietnam National University) In this paper, we describe how to use the Maximum Reduced Proper Motion method (Phan-Bao et al. 2003) to detect 57 nearby L and late-M dwarfs (d_phot &l...
Dwarf WISEP J1541-225 (Preview)	Stars	0	1238	Aug 30 13:42 2011 by Blobrana
It looks like we have a new neighbour. It's actually been there all along, but astronomers have only now spotted what could be the seventh closest star system to the sun. The system is just nine light years away, a mere stone's throw in astronomical terms. It took so long to find because it's an extremel...
Dwarf WISEP J182831.08+265037.8 (Preview)	Stars	1	1305	Jan 10 01:10 2013 by Blobrana
The Coldest Brown Dwarf Catalogued as WISE 1828+2650, this brown dwarf lies within 40 light-years of the Sun and is currently the coldest brown dwarf known. Brown dwarfs are roughly the size of the planet Jupiter. WISE 1828+2650, assigned to spectral class Y, has the estimated temperature of a war...
Dwarf WISEP J180026.60+013453.1 (Preview)	Stars	0	1220	Sep 2 06:44 2011 by Blobrana
Title: WISEP J180026.60+013453.1: A Nearby Late L Dwarf Near the Galactic Plane Authors: John E. Gizis, Adam J. Burgasser, Jacqueline K. Faherty, Philip J. Castro, Michael M. Shara We report a nearby L7.5 dwarf discovered using the Preliminary Data Release of the Wide-field Infrared Survey Expl...