A big γ-ray burst at a redshift of z ≈ 8.2 (2009)
Tanvir, N. R., Fox, D. B., Levan, A. J., Berger, E., Wiersema, K., Fynbo, J. P. U., ...
4 pages, 3 figures.-- ArXiv pre-print available at: http://arxiv.org/abs/0906.1577
A γ-ray burst at a redshift of z ≈ 8.2 (2009)
Tanvir, N. R., Fox , D. B., Levan, A. J., Berger, E., Wiersema, K., Fynbo, J. P. U., ...
Long-duration γ-ray bursts (GRBs) are thought to result from the explosions of certain massive stars, and some are bright enough that they should be observable out to redshifts of z > 20 using...
X-Ray and Infrared Observations of Two Externally Polluted White Dwarfs (2009)
Jura, M., Muno, M. P., Farihi, J., Zuckerman, B.
With XMM-Newton and the Spitzer Space Telescope, we obtain upper bounds to the X-ray fluxes from G29-38 and GD 362, and the 70 μm flux from G29-38. These data provide indirect evidence that G29-38...
IRTF Observations of White Dwarfs with Possible Near-Infrared Excess (2009)
Near-infrared photometry and spectroscopy is obtained for a heterogeneous sample of nearby white dwarfs with possible excess flux as identified primarily in the Two Micron All Sky Survey. Among the...
VLT/NACO Deep imaging survey of young, nearby austral stars (2009)
Chauvin, G., Bonavita, M., Zuckerman, B., Dumas, C., Bessell, M. S., ...
Since November 2002, we have conducted the largest deep imaging survey of the young, nearby associations of the southern hemisphere. Our goal is detection and characterization of substellar...
A glimpse of the end of the dark ages: the gamma-ray burst of 23 April 2009 at redshift 8.3 (2009)
Tanvir, N. R., Fox, D. B., Levan, A. J., Berger, E., Wiersema, K., Fynbo, J. P. U., ...
It is thought that the first generations of massive stars in the Universe were an important, and quite possibly dominant, source of the ultra-violet radiation that reionized the hydrogen gas in the...
X-ray and Infrared Observations of Two Externally-Polluted White Dwarfs (2009)
Jura, M., Muno, M. P., Farihi, J., Zuckerman, B.
With XMM-Newton and the Spitzer Space Telescope, we obtain upper bounds to the X-ray fluxes from G29-38 and GD 362, and the 70 micron flux from G29-38. These data provide indirect evidence that...
PHL 5038: A spatially resolved white dwarf + brown dwarf binary (2009)
Steele, P. R., Burleigh, M. R., Farihi, J., Gaensicke, B. T., Jameson, R. F., Dobbie, P. D., ...
A near-infrared excess is detected at the white dwarf PHL5038 in UKIDSS photometry, consistent with the presence of a cool, substellar companion. We have obtained H- and K-grism spectra and images of...
Infrared Signatures of Disrupted Minor Planets at White Dwarfs (2009)
Farihi, J., Jura, M., Zuckerman, B.
Spitzer Space Observatory IRAC and MIPS photometric observations are presented for 20 white dwarfs with T < 20,000 K and metal-contaminated photospheres. A warm circumstellar disk is detected at GD...
Six White Dwarfs with Circumstellar Silicates (2008)
Jura, M., Farihi, J., Zuckerman, B.
Spitzer Space Telescope spectra reveal 10 micron silicate emission from circumstellar dust orbiting six externally-polluted white dwarfs. Micron-size glasses with an olivine stoichiometry can account...
Kilic, Mukremin, Farihi, J., Nitta, Atsuko, Leggett, S. K.
Here, we present near-infrared spectroscopic observations of 15 helium atmosphere, metal-rich white dwarfs obtained at the NASA Infrared Telescope Facility. While a connection has been demonstrated...
Farihi, J., Becklin, E. E., Zuckerman, B.
This paper presents a sensitive and comprehensive IRAC 3-8 $\mu$m photometric survey of white dwarfs for companions in the planetary mass regime with temperatures cooler than the known T dwarfs. The...
Farihi, J., Burleigh, M. R., Hoard, D. W.
The nature of the excess near-infrared emission associated with the magnetic white dwarf commonly known as SDSS 1212 is investigated primarily through spectroscopy, and also via photometry. The...
Using The, Near Infrared, Camera On, The Hubble, Space Telescope, J. Farihi, ...
A search of 116 nearby young stars has been carried out in Cycle 13 with the Hubble Space Telescope using the Near Infrared Camera and Multi Object Spectrograph (NICMOS). Camera 2 coronagraphic...
Farihi, J., Burleigh, M. R., Hoard, D. W.
The nature of the excess near-infrared emission associated with the magnetic white dwarf commonly known as SDSS 1212 is investigated primarily through spectroscopy, and also via photometry. The...
Spitzer IRAC Observations of White Dwarfs. I. Warm Dust at Metal-Rich Degenerates (2007)
Farihi, J., Zuckerman, B., Becklin, E. E.
This paper presents the results of a Spitzer IRAC 3-8 micron photometric search for warm dust orbiting 17 nearby, metal-rich white dwarfs, 15 of which apparently have hydrogen dominated atmospheres...
Externally-polluted white dwarfs with dust disks (2007)
Jura, M., Farihi, J., Zuckerman, B.
We report Spitzer Space Telescope photometry of eleven externally-polluted white dwarfs. Of the nine stars for which we have IRAC photometry, we find that GD 40, GD 133 and PG 1015+161 each has an...
Infrared Emission from the Dusty Disk Orbiting GD 362, An Externally-Polluted White Dwarf (2007)
Jura, M., Farihi, J., Zuckerman, B., Becklin, E. E.
We report Spitzer Space Telescope photometry between 3.6 microns and 24 microns and spectroscopy between 5 microns and 15 microns of GD 362, a white dwarf with an effective temperature near 10,000 K...
Spitzer Observations of GD 362 and Other Metal-Rich White Dwarfs (2006)
Farihi, J., Zuckerman, B., Becklin, E. E., Jura, M.
A {\em Spitzer} IRAC survey of 17 nearby metal-rich white dwarfs, nominally DAZ stars, reveals excess emission from only 3 targets: G29-38, GD 362 and G167-8. Observations of GD 362 with all three...
Song, Inseok, Schneider, G., Zuckerman, B., Farihi, J., Becklin, E. E., Bessell, M. S., ...
Multi-band (0.9 to 1.6 um) images of the TW Hydrae Association (TWA) brown dwarf, 2MASS J1207334-393254 (also known as 2M1207), and its candidate planetary mass companion (2M1207b) were obtained on...
Burleigh, M. R., Marsh, T. R., Gansicke, B. T., Goad, M. R., Dhillon, V. S., Littlefair, S. P., ...
Optical time series photometry of the short period magnetic white dwarf + probable brown dwarf binary SDSS 121209.31+013627.7 reveals pulse-like variability in all bands from i' to u', peaking at u'....
White Dwarf - Red Dwarf Systems Resolved with the Hubble Space Telescope: I. First Results (2006)
Farihi, J., Hoard, D. W., Wachter, S.
First results are presented for a Hubble Space Telescope Advanced Camera for Surveys snapshot study of white dwarfs with likely red dwarf companions. Of 48 targets observed and analyzed so far, 27...
Burleigh, Matthew R., Marsh, T.R., Gänsicke, B.T., Goad, Michael R., Dhillon, V.S., Littlefair, S.P., ...
Submitted for publication in Monthly Notices of the Royal Astronomical Society by the Royal Astronomical Society and Blackwell Publishing.
Low Mass Companions to White Dwarfs (2005)
Farihi, J., Zuckerman, B., Becklin, E. E.
This paper summarizes the results of over 17 years of work searching for low mass stellar and substellar companions to more than 370 nearby white dwarfs. Roughly 60 low mass, unevolved companions...
A Dusty Disk Around GD 362, a White Dwarf With a Uniquely High Photospheric Metal Abundance (2005)
Becklin, E. E., Farihi, J., Jura, M., Song, Inseok, Weinberger, A. J., Zuckerman, B.
Eighteen years after an infrared excess was discovered associated with the white dwarf G29-38, we report ground-based measurements (JHKL'N') with mJy-level sensitivity of GD 362 that show it to be a...
Mid-Infrared Observations of the White Dwarf Brown Dwarf Binary GD 1400 (2005)
Farihi, J., Zuckerman, B., Becklin, E. E.
Fluxes are measured for the DA white dwarf plus brown dwarf pair GD 1400 with the Infrared Array Camera on the {\em Spitzer Space Telescope}. GD 1400 displays an infrared excess over the entire...
Low Luminosity Companions to White Dwarfs (2005)
Farihi, J., Becklin, E. E., Zuckerman, B.
This paper presents results of a near-infrared imaging survey for low mass stellar and substellar companions to white dwarfs. A wide field proper motion survey of 261 white dwarfs was capable of...
SSSPM J1549$-$3544 Is Not a White Dwarf (2005)
Farihi, J., Wood, P. R., Stalder, B.
Spectroscopy and photometry demonstrate that SSSPM J1549$-$3544 is not a cool white dwarf but a high velocity metal-poor halo star.
Cool Versus Ultracool White Dwarfs (2005)
A preliminary $BVRIJHK$ analysis of the white dwarfs SSSPM J2231$-$7514 and SSSPM J2231$-$7515 is presented. Although both stars were reported to have $T_{\rm eff}
A Possible Brown Dwarf Companion to the White Dwarf GD1400 (2004)
An unresolved, likely L dwarf companion to the DA white dwarf GD1400 is reported. This would be only the second such system known, discovered 17 years after the prototype L dwarf, GD165B, was...
Mid Infrared Observations of Van Maanen 2: No Substellar Companion (2004)
Farihi, J., Becklin, E. E., Macintosh, B. A.
The results of a comprehensive infrared imaging search for the putative 0.06 solar mass astrometric companion to the 4.4 pc white dwarf van Mannen 2 are reported. Adaptive optics images acquired at...
Discovery of an Ultracool White Dwarf Companion (2004)
The discovery of a low luminosity common proper motion companion to the white dwarf GD392 at a wide separation of $46''$ is reported. $BVRI$ photometry suggests a low temperature ($T_{\rm...
The Search for Brown Dwarfs around White Dwarfs (2002)
Farihi, J., Becklin, E. E., Zuckerman, B.
The infrared search for substellar companions to nearby white dwarfs has been going for a little more than a decade. The most recent phase has been a wide field proper motion search carried out...
GD248B, The Coolest Known Helium Atmosphere White Dwarf (2002)
Farihi, J., Becklin, E. E., Zuckerman, B.
This is to notify colleagues that our ApJ paper and corresponding astro-ph version are being withdrawn. Optical spectroscopy obtained with a 3m class telescope gave no indication of any features in...