SOUSA: the Swift Optical/Ultraviolet Supernova Archive

Brown, P. J.; Breeveld, A. A.; Holland, S. T.; Kuin, P.; Pritchard, T. A.

doi:10.1007/s10509-014-2059-8

Cited by 246 publications

(196 citation statements)

References 44 publications

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“…The Swift/UVOT data was processed using the method of the Swift Optical/Ultraviolet Supernova Archive (SOUSA; Brown et al 2014). We combined pre-outburst observations Breeveld et al (2011).…”

Section: Swift/uvot Imagingmentioning

confidence: 99%

The Intermediate Luminosity Optical Transient Sn 2010da: The Progenitor, Eruption, and Aftermath of a Peculiar Supergiant High-Mass X-Ray Binary

Villar

Berger

Chornock

et al. 2016

ApJ

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We present optical spectroscopy, ultraviolet-to-infrared imaging,and X-ray observations of the intermediate luminosity optical transient (ILOT) SN 2010da in NGC 300 (d = 1.86 Mpc) spanning from −6 to +6 years relative to the time of outburst in 2010. Based on the light-curve and multi-epoch spectral energy distributions of SN 2010da, we conclude that the progenitor of SN 2010da is a ≈10-12 M e yellow supergiant possibly transitioning into a blue-loop phase. During outburst, SN 2010da had a peak absolute magnitude of M bol −10.4 mag, dimmer than other ILOTs and supernova impostors. We detect multi-component hydrogen Balmer, Paschen, and Ca II emission lines in our high-resolution spectra, which indicate a dusty and complex circumstellar environment. Since the 2010 eruption, the star has brightened by a factor of ≈5 and remains highly variable in the optical. Furthermore, we detect SN 2010da in archival Swift and Chandra observations as an ultraluminous X-ray source (L X ≈ 6 × 10 39 erg s −1). We additionally attribute He II 4686 Å and coronal Fe emission lines in addition to a steady X-ray luminosity of ≈10 37 erg s −1 to the presence of a compact companion.

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Section: Swift/uvot Imagingmentioning

confidence: 99%

The Intermediate Luminosity Optical Transient Sn 2010da: The Progenitor, Eruption, and Aftermath of a Peculiar Supergiant High-Mass X-Ray Binary

Villar

Berger

Chornock

et al. 2016

ApJ

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“…All groundbased photometry was calibrated using either Landolt standards or stellar photometry from the Sloan Digital Sky Survey. Furthermore, the UVOT photometry was obtained from the Swift Optical/Ultraviolet Supernova Archive (SOUSA; Brown et al 2014). The reduction is based on that of Brown et al (2009), including subtraction of the host-galaxy count rates, and uses the revised UV zeropoints and time-dependent sensitivity from Breeveld et al (2011).…”

Section: Discovery and Observations Of Sn 2013gh And Iptf 13dgementioning

confidence: 99%

Time-varying sodium absorption in the Type Ia supernova 2013gh

Ferretti

Amanullah

Goobar

et al. 2016

A&A

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Context. Temporal variability of narrow absorption lines in high-resolution spectra of Type Ia supernovae (SNe Ia) is studied to search for circumstellar matter. Time series which resolve the profiles of absorption lines such as Na I D or Ca II H&K are expected to reveal variations due to photoionisation and subsequent recombination of the gases. The presence, composition, and geometry of circumstellar matter may hint at the elusive progenitor system of SNe Ia and could also affect the observed reddening law. Aims. To date, there are few known cases of time-varying Na I D absorption in SNe Ia, all of which occurred during relatively late phases of the supernova (SN) evolution. Photoionisation, however, is predicted to occur during the early phases of SNe Ia, when the supernovae peak in the ultraviolet. We attempt, therefore, to observe early-time absorption-line variations by obtaining high-resolution spectra of SNe before maximum light. Methods. We have obtained photometry and high-resolution spectroscopy of SNe Ia 2013gh and iPTF 13dge, to search for absorptionline variations. Furthermore, we study interstellar absorption features in relation to the observed photometric colours of the SNe. Results. Both SNe display deep Na I D and Ca II H&K absorption features. Furthermore, small but significant variations are detected in a feature of the Na I D profile of SN 2013gh. The variations are consistent with either geometric effects of rapidly moving or patchy gas clouds or photoionisation of Na I gas at R ≈ 10 19 cm from the explosion. Conclusions. Our analysis indicates that it is necessary to focus on early phases to detect photoionisation effects of gases in the circumstellar medium of SNe Ia. Different absorbers such as Na I and Ca II can be used to probe for matter at different distances from the SNe. The nondetection of variations during early phases makes it possible to put limits on the abundance of the species at those distances.

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“…We attempted to decontaminate an additional observation from 2010 July 12 but were unable to extract a viable spectrum due to contamination from an extremely bright nearby bright zeroth order source for which a reliable coincidence loss could not be calculated. The phase of this observation was calculated using the UVOT photometry B-band time of maximum light of JD = 2455385.4 from the Swift Optical/Ultraviolet Supernova Archive (SOUSA) (Brown et al 2014a). …”

Section: 4 Sn 2010evmentioning

confidence: 99%

“…The phases of these observations were calculated using the UVOT photometry B-band time of maximum light of JD = 2455690.9 from SOUSA (Brown et al 2014a). …”

Section: Sn 2011bymentioning

confidence: 99%

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DecontaminatingSwiftUVOT Grism Observations of Transient Sources

Smitka¹,

Brown²,

Kuin³

et al. 2016

PASP

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We present a new technique of decontaminating Swift UVOT grism spectra for transient objects. We describe the template image requirements and image processing steps necessary to successfully implement the empirical decontamination technique. We demonstrate the accuracy of the flux and wavelength calibrations for decontaminated spectra by comparing a spectrum of SN 2011fe with a well-calibrated, long-slit ultraviolet spectrum from the Hubble Space Telescope's Space Telescope Imaging Spectrograph. We also show how the decontamination removes spurious emission lines from spectra of iPTF14bdn which otherwise could be misinterpreted as coming from the supernova. The software which implements this technique is briefly discussed and is made available to the community.

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SOUSA: the Swift Optical/Ultraviolet Supernova Archive

Cited by 246 publications

References 44 publications

The Intermediate Luminosity Optical Transient Sn 2010da: The Progenitor, Eruption, and Aftermath of a Peculiar Supergiant High-Mass X-Ray Binary

The Intermediate Luminosity Optical Transient Sn 2010da: The Progenitor, Eruption, and Aftermath of a Peculiar Supergiant High-Mass X-Ray Binary

Time-varying sodium absorption in the Type Ia supernova 2013gh

DecontaminatingSwiftUVOT Grism Observations of Transient Sources

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