Low RV from Circumstellar Dust around Supernovae

By A. Goobar. 2008

135 citations recorded by the source corpus.

The effective extinction law for supernovae surrounded by circumstellar dust is examined with Monte Carlo simulations. Grains with light scattering properties as for interstellar dust in the Milky Way (MW) or the Large Magellanic Clouds (LMC), but surrounding the explosion site, would cause a semidiffusive propagation of light up to the edge of the dust shell. Multiple scattering of photons predominantly attenuates photons with shorter wavelengths, thus steepening the effective extinction law as compared to the case of single scattering in the interstellar medium. Our simulations yield typical values for the total-to-selective extinction ratio RV ∼ 1.5–2.5, as seen in recent studies of Type Ia supernova colors, with a steepening differential extinction toward shorter wavelengths.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/864aae39f647937ebd38c325579f43b4fa513c14

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In Astronomy and Astrophysics

1. A. Riess
2. A. Filippenko
3. R. Kirshner
4. D. Schneider
5. S. Jha
6. Weidong Li
7. N. Smith
8. J. Silverman

Citations in the corpus

• TYPE Ia SUPERNOVA LIGHT CURVE INFERENCE: HIERARCHICAL MODELS IN THE OPTICAL AND NEAR-INFRARED (2010, methodology): “It has been suggested that low RV values could result from scattering by circumstellar dust in the local environment of the SN (Wang 2005; Goobar 2008).”
• ON THE SOURCE OF THE DUST EXTINCTION IN TYPE Ia SUPERNOVAE AND THE DISCOVERY OF ANOMALOUSLY STRONG Na i ABSORPTION (2013, background): “…evidence that the extinction arises in circumstellar The Astrophysical Journal, 779:38 (21pp), 2013 December 10 Phillips et al. dust (Wang 2005; Goobar 2008), as the consequence of intrinsic differences in color between SNe Ia with “normal” and “high” Si ii expansion velocities (Foley & Kasen…”
• IMPROVED DISTANCES TO TYPE Ia SUPERNOVAE WITH TWO SPECTROSCOPIC SUBCLASSES (2009, background): “The lower value of RV might be naturally explained by multiple scattering in the CS dust shell (Goobar 2008).”
• SPECTRA AND HUBBLE SPACE TELESCOPE LIGHT CURVES OF SIX TYPE Ia SUPERNOVAE AT 0.511 < z < 1.12 AND THE UNION2 COMPILATION (2010, background): “Local effects could be intrinsic SN variations, but also multiple scattering on dust in the circumstellar environment has been suggested (Wang 2005; Goobar 2008).”
• THE CARNEGIE SUPERNOVA PROJECT: ANALYSIS OF THE FIRST SAMPLE OF LOW-REDSHIFT TYPE-Ia SUPERNOVAE (2009, methodology): “Recently, Goobar (2008) has considered a model where multiple scattering of photons by circumstellar dust steepens the effective extinction law, converting it to a power law.”
• THE EFFECT OF HOST GALAXIES ON TYPE Ia SUPERNOVAE IN THE SDSS-II SUPERNOVA SURVEY (2010, background): “Alternatively, in a study of 80 nearby SNe Ia, Nobili & Goobar (2008) found a value of RV = 1.75 ± 0.27 for their whole sample and a lower value of RV ∼ 1 if they restrict the sample to low reddening values.”
• FIRST-YEAR SLOAN DIGITAL SKY SURVEY-II SUPERNOVA RESULTS: HUBBLE DIAGRAM AND COSMOLOGICAL PARAMETERS (2009, methodology): “This method has been applied to the nearby SN sample (Phillips et al. 1999; Altavilla et al. 2004; Reindl et al. 2005; Riess et al. 1996; Nobili & Goobar 2008), resulting in RV values in the range of 2 − 3, somewhat lower than the Milky Way average value.”