Enigmas from the Sloan Digital Sky Survey DR7 White Dwarf Catalog

James Liebert; Paul S Smith; Lilia Ferrario; Dayal Wickramasinghe

Enigmas from the Sloan Digital Sky Survey DR7 White Dwarf Catalog

James Liebert, Paul S Smith, Lilia Ferrario, Dayal Wickramasinghe

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

We report results from a continuation of our searches for magnetic white dwarfs paired in a detached binary with a non-degenerate companion, using the Data Release 7 (DR7) of the Sloan Digital Sky Survey. Some 19,712 spectroscopically-identified white dwarfs from the Kleinman et al. paper were examined, including 1,951 white dwarf - M dwarf pairs. The polar (AM Her) system ST LMi in a low state was found but later recognized not to be a detached pair. Our basic result is that the original situation reported 10 years ago is still the case with now very high statistical significance. Detached polar progenitors, apart from Low Accretion Rate Polars (LARPs), are not found. Magnetic white dwarfs likely form from mergers of (nonmagnetic) white dwarfs, while polars and intermediate polars emerge from common envelope evolution as close binaries either Roche-lobe-filling mass transfer mode or LARPs.

Original language	English
Title of host publication	ASP Conference Series, Vol. 493
Editors	P Dufour, P Bergeron & G Fontaine
Place of Publication	TBC
Publisher	Astronomical Society of the Pacific
Pages	493-494pp
Edition	to be checked
Publication status	Published - 2015
Event	19th European Workshop on White Dwarfs - MontrÃ©al, Canada Duration: 1 Jan 2015 → …

Conference

Conference	19th European Workshop on White Dwarfs
Period	1/01/15 → …
Other	August 11-15th 2014

Cite this

@inproceedings{54d274f4e92e491a93935e85af9dcd5f,

title = "Enigmas from the Sloan Digital Sky Survey DR7 White Dwarf Catalog",

abstract = "We report results from a continuation of our searches for magnetic white dwarfs paired in a detached binary with a non-degenerate companion, using the Data Release 7 (DR7) of the Sloan Digital Sky Survey. Some 19,712 spectroscopically-identified white dwarfs from the Kleinman et al. paper were examined, including 1,951 white dwarf - M dwarf pairs. The polar (AM Her) system ST LMi in a low state was found but later recognized not to be a detached pair. Our basic result is that the original situation reported 10 years ago is still the case with now very high statistical significance. Detached polar progenitors, apart from Low Accretion Rate Polars (LARPs), are not found. Magnetic white dwarfs likely form from mergers of (nonmagnetic) white dwarfs, while polars and intermediate polars emerge from common envelope evolution as close binaries either Roche-lobe-filling mass transfer mode or LARPs.",

author = "James Liebert and Smith, {Paul S} and Lilia Ferrario and Dayal Wickramasinghe",

year = "2015",

language = "English",

pages = "493--494pp",

editor = "{P Dufour, P Bergeron & G Fontaine}",

booktitle = "ASP Conference Series, Vol. 493",

publisher = "Astronomical Society of the Pacific",

edition = "to be checked",

note = "19th European Workshop on White Dwarfs ; Conference date: 01-01-2015",

}

Enigmas from the Sloan Digital Sky Survey DR7 White Dwarf Catalog. / Liebert, James; Smith, Paul S; Ferrario, Lilia et al.
ASP Conference Series, Vol. 493. ed. / P Dufour, P Bergeron & G Fontaine. to be checked. ed. TBC: Astronomical Society of the Pacific, 2015. p. 493-494pp.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

TY - GEN

T1 - Enigmas from the Sloan Digital Sky Survey DR7 White Dwarf Catalog

AU - Liebert, James

AU - Smith, Paul S

AU - Ferrario, Lilia

AU - Wickramasinghe, Dayal

PY - 2015

Y1 - 2015

N2 - We report results from a continuation of our searches for magnetic white dwarfs paired in a detached binary with a non-degenerate companion, using the Data Release 7 (DR7) of the Sloan Digital Sky Survey. Some 19,712 spectroscopically-identified white dwarfs from the Kleinman et al. paper were examined, including 1,951 white dwarf - M dwarf pairs. The polar (AM Her) system ST LMi in a low state was found but later recognized not to be a detached pair. Our basic result is that the original situation reported 10 years ago is still the case with now very high statistical significance. Detached polar progenitors, apart from Low Accretion Rate Polars (LARPs), are not found. Magnetic white dwarfs likely form from mergers of (nonmagnetic) white dwarfs, while polars and intermediate polars emerge from common envelope evolution as close binaries either Roche-lobe-filling mass transfer mode or LARPs.

AB - We report results from a continuation of our searches for magnetic white dwarfs paired in a detached binary with a non-degenerate companion, using the Data Release 7 (DR7) of the Sloan Digital Sky Survey. Some 19,712 spectroscopically-identified white dwarfs from the Kleinman et al. paper were examined, including 1,951 white dwarf - M dwarf pairs. The polar (AM Her) system ST LMi in a low state was found but later recognized not to be a detached pair. Our basic result is that the original situation reported 10 years ago is still the case with now very high statistical significance. Detached polar progenitors, apart from Low Accretion Rate Polars (LARPs), are not found. Magnetic white dwarfs likely form from mergers of (nonmagnetic) white dwarfs, while polars and intermediate polars emerge from common envelope evolution as close binaries either Roche-lobe-filling mass transfer mode or LARPs.

M3 - Conference contribution

SP - 493

EP - 494

BT - ASP Conference Series, Vol. 493

A2 - null, P Dufour, P Bergeron & G Fontaine

PB - Astronomical Society of the Pacific

CY - TBC

T2 - 19th European Workshop on White Dwarfs

Y2 - 1 January 2015

ER -

Enigmas from the Sloan Digital Sky Survey DR7 White Dwarf Catalog

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