Search Results - "FARIHI, J"

Circumstellar debris and pollution at white dwarf stars by Farihi, J.

“…Circumstellar disks of planetary debris are now known or suspected to closely orbit hundreds of white dwarf stars. To date, both data and theory support disks…”
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Evidence for Water in the Rocky Debris of a Disrupted Extrasolar Minor Planet by Farihi, J., Gänsicke, B. T., Koester, D.

“…The existence of water in extrasolar planetary systems is of great interest because it constrains the potential for habitable planets and life. We have…”
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Stochastic accretion of planetesimals on to white dwarfs: constraints on the mass distribution of accreted material from atmospheric pollution by Wyatt, M. C., Farihi, J., Pringle, J. E., Bonsor, A.

“…This paper explores how the stochastic accretion of planetesimals on to white dwarfs would be manifested in observations of their atmospheric pollution…”
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Signs of a faint disc population at polluted white dwarfs by Bergfors, C, Farihi, J, Dufour, P, Rocchetto, M

“…Observations of atmospheric metals and dust discs around white dwarfs provide important clues to the fate of terrestrial planetary systems around…”
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The chemical diversity of exo-terrestrial planetary debris around white dwarfs by Gänsicke, B. T., Koester, D., Farihi, J., Girven, J., Parsons, S. G., Breedt, E.

“…We present Hubble Space Telescope (HST) ultraviolet spectroscopy of the white dwarfs PG 0843+516, PG 1015+161, SDSS 1228+1040, and GALEX 1931+0117, which…”
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Likely detection of water-rich asteroid debris in a metal-polluted white dwarf by Raddi, R., Gänsicke, B. T., Koester, D., Farihi, J., Hermes, J. J., Scaringi, S., Breedt, E., Girven, J.

“…The cool white dwarf SDSS J124231.07+522626.6 exhibits photospheric absorption lines of eight distinct heavy elements in medium resolution optical spectra,…”
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Missing metals in DQ stars: a compelling clue to their origin by Farihi, J, Dufour, P, Wilson, T G

“…ABSTRACT White dwarf stars frequently experience external pollution by heavy elements, and yet the intrinsically carbon-enriched DQ spectral class members fail…”
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The frequency and infrared brightness of circumstellar discs at white dwarfs by Rocchetto, M., Farihi, J., Gänsicke, B. T., Bergfors, C.

“…White dwarfs whose atmospheres are polluted by terrestrial-like planetary debris have become a powerful and unique tool to study evolved planetary systems…”
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IRTF observations of white dwarfs with possible near-infrared excess by Farihi, J.

“…Near-infrared photometry and spectroscopy are obtained for a heterogeneous sample of nearby white dwarfs with possible excess flux as identified primarily in…”
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Discovery of dipolar chromospheres in two white dwarfs by Farihi, J, Hermes, J J, Littlefair, S P, Howarth, I D, Walters, N, Parsons, S G

“…ABSTRACT This paper reports the ULTRACAM discovery of dipolar surface spots in two cool magnetic white dwarfs with Balmer emission lines, while a third system…”
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Measurement of stellar and substellar winds using white dwarf hosts by Walters, N, Farihi, J, Dufour, P, Pineda, J S, Izzard, R G

“…ABSTRACT White dwarfs stars are known to be polluted by their active planetary systems, but little attention has been paid to the accretion of wind from…”
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Magnetospherically-trapped dust and a possible model for the unusual transits at WD 1145+017 by Farihi, J, von Hippel, T, Pringle, J E

“…Abstract The rapidly evolving dust and gas extinction observed towards WD 1145+017 has opened a real-time window on to the mechanisms for destruction-accretion…”
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The magnetic and metallic degenerate G77-50 by Farihi, J., Dufour, P., Napiwotzki, R., Koester, D.

“…An accumulation of multi-epoch, high-resolution optical spectra reveal that the nearby star G77-50 is a very cool DAZ white dwarf externally polluted by Mg,…”
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Externally Polluted White Dwarfs with Dust Disks by Jura, M, Farihi, J, Zuckerman, B

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Scars of intense accretion episodes at metal-rich white dwarfs by Farihi, J., Gänsicke, B. T., Wyatt, M. C., Girven, J., Pringle, J. E., King, A. R.

“…A re-evaluation of time-averaged accretion rates at DBZ-type white dwarfs points to historical, time-averaged rates significantly higher than the currently…”
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Gaia white dwarfs within 40 pc – I. Spectroscopic observations of new candidates by Tremblay, P-E, Hollands, M A, Gentile Fusillo, N P, McCleery, J, Izquierdo, P, Gänsicke, B T, Cukanovaite, E, Koester, D, Brown, W R, Charpinet, S, Cunningham, T, Farihi, J, Giammichele, N, van Grootel, V, Hermes, J J, Hoskin, M J, Jordan, S, Kepler, S O, Kleinman, S J, Manser, C J, Marsh, T R, de Martino, D, Nitta, A, Parsons, S G, Pelisoli, I, Raddi, R, Rebassa-Mansergas, A, Ren, J-J, Schreiber, M R, Silvotti, R, Toloza, O, Toonen, S, Torres, S

“…ABSTRACT We present a spectroscopic survey of 230 white dwarf candidates within 40 pc of the Sun from the William Herschel Telescope and Gran Telescopio…”
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Evidence for halo kinematics among cool carbon-rich dwarfs by Farihi, J, Arendt, A R, Machado, H S, Whitehouse, L J

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Relentless and complex transits from a planetesimal debris disc by Farihi, J, Hermes, J J, Marsh, T R, Mustill, A J, Wyatt, M C, Guidry, J A, Wilson, T G, Redfield, S, Izquierdo, P, Toloza, O, Gänsicke, B T, Aungwerojwit, A, Kaewmanee, C, Dhillon, V S, Swan, A

“…ABSTRACT This article reports quasi-continuous transiting events towards WD 1054–226 at d = 36.2 pc and V = 16.0 mag, based on simultaneous, high-cadence,…”
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Dwarf carbon stars are likely metal-poor binaries and unlikely hosts to carbon planets by Whitehouse, L J, Farihi, J, Green, P J, Wilson, T G, Subasavage, J P

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Solar abundances of rock-forming elements, extreme oxygen and hydrogen in a young polluted white dwarf by Farihi, J, Koester, D, Zuckerman, B, Vican, L, Gaensicke, B T, Smith, N, Walth, G, Breedt, E

“…The T^sub eff^ = 20,800 K white dwarf WD 1536+520 is shown to have broadly solar abundances of the major rock-forming elements O, Mg, Al, Si, Ca, and Fe,…”
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