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The Astrophysical Journal (ApJ)

Resumen/Descripción – provisto por la editorial en inglés

The Astrophysical Journal is an open access journal devoted to recent developments, discoveries, and theories in astronomy and astrophysics. Publications in ApJ constitute significant new research that is directly relevant to astrophysical applications, whether based on observational results or on theoretical insights or modeling.

Palabras clave – provistas por la editorial

astronomy; astrophysics

Disponibilidad

Institución detectada	Período	Navegá	Descargá	Solicitá
No detectada	desde jul. 1995 / hasta dic. 2023	IOPScience

Información

Tipo de recurso:

revistas

ISSN impreso

0004-637X

ISSN electrónico

1538-4357

Editor responsable

American Astronomical Society (AAS)

Idiomas de la publicación

inglés

País de edición

Reino Unido

Información sobre licencias CC

https://creativecommons.org/licenses/by/4.0/

Cobertura temática

Ciencias físicas

Tabla de contenidos

doi: 10.1088/0004-637x/759/1/20

ON ABSORPTION BY CIRCUMSTELLAR DUST, WITH THE PROGENITOR OF SN 2012aw AS A CASE STUDY

C. S. Kochanek; R. Khan; X. Dai

<jats:title>ABSTRACT</jats:title> <jats:p>We use the progenitor of SN 2012aw to illustrate the consequences of modeling circumstellar dust using Galactic (interstellar) extinction laws that (1) ignore dust emission in the near-IR and beyond, (2) average over dust compositions, and (3) mischaracterize the optical/UV absorption by assuming that scattered photons are lost to the observer. The primary consequences for the progenitor of SN 2012aw are that both the luminosity and the absorption are significantly overestimated. In particular, the stellar luminosity is most likely in the range 10<jats:sup>4.8</jats:sup> < <jats:italic>L</jats:italic> <jats:sub>*</jats:sub>/<jats:italic>L</jats:italic> <jats:sub>☉</jats:sub> < 10<jats:sup>5.0</jats:sup> and the star was not extremely massive for a Type IIP progenitor, with <jats:italic>M</jats:italic> <jats:sub>*</jats:sub> < 15 <jats:italic>M</jats:italic> <jats:sub>☉</jats:sub>. Given the properties of the circumstellar dust and the early X-ray/radio detections of SN 2012aw, the star was probably obscured by an ongoing wind with <jats:inline-formula> <jats:tex-math><?CDATA $\dot{M}\sim 10^{-5.5}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="apj445827ieqn1.gif" xlink:type="simple" /> </jats:inline-formula> to 10<jats:sup>−5.0</jats:sup> <jats:italic>M</jats:italic> <jats:sub>☉</jats:sub> yr<jats:sup>−1</jats:sup> at the time of the explosion, roughly consistent with the expected mass-loss rates for a star of its temperature (<jats:italic>T</jats:italic> <jats:sub>*</jats:sub> ≃ 3600<jats:sup>+300</jats:sup> <jats:sub>− 200</jats:sub> K) and luminosity. In the spirit of Galactic extinction laws, we supply simple interpolation formulae for circumstellar extinction by dusty graphitic and silicate shells as a function of wavelength (λ ⩾ 0.3 μm) and total (absorption plus scattering) <jats:italic>V</jats:italic>-band optical depth (τ<jats:sub> <jats:italic>V</jats:italic> </jats:sub> ⩽ 20). These do not include the contributions of dust emission, but provide a simple, physical alternative to incorrectly using interstellar extinction laws.</jats:p>