Massive stars exploding in a He-rich circumstellar medium - II. The transitional case of SN 2005la

Pastorello, A.; Quimby, R.; Smartt, S. J.; Mattila, S.; Navasardyan, H.; Crockett, R. M.; Elias‐Rosa, N.; Mondol, P.; Wheeler, J. C.; Young, D. R.

doi:10.1111/j.1365-2966.2008.13603.x

Cited by 86 publications

(124 citation statements)

References 52 publications

(72 reference statements)

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“…9). These features are detected in many interacting supernovae such as 1997eg, 1995G, 2005la (Salamanca et al 2002;Hoffman et al 2008;Pastorello et al 2002Pastorello et al , 2008b Fig. 9, shows convincing evidence that in the spectra of interacting SNe this is due to a lack of emission lines amongst a dense forest, rather than an absorption trough.…”

Section: Comparison With Other Interacting Snementioning

confidence: 87%

Possible evidence of asymmetry in SN 2007rt, a type IIn supernova

Trundle¹,

Pastorello²,

Benetti

et al. 2009

A&A

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An optical photometric and spectroscopic analysis of the slowly-evolving type IIn SN 2007rt is presented, covering a duration of 481 days after discovery. Its earliest spectrum, taken approximately 100 days after the explosion epoch, indicates the presence of a dense circumstellar medium, with which the supernova ejecta is interacting. This is supported by the slowly-evolving light curve. A notable feature in the spectrum of SN 2007rt is the presence of a broad He i 5875 line, not usually detected in type IIn supernovae.This may imply that the progenitor star has a high He/H ratio, having shed a significant portion of its hydrogen shell via mass-loss. An intermediate resolution spectrum reveals a narrow H α P-Cygni profile, the absorption component of which has a width of 128 km s −1 . This slow velocity suggests that the progenitor of SN 2007rt recently underwent mass-loss with wind speeds comparable to the lower limits of those detected in luminous blue variables. Asymmetries in the line profiles of H and He at early phases bears some resemblance to double-peaked features observed in a number of Ib/c spectra. These asymmetries may be indicative of an asymmetric or bipolar outflow or alternatively dust formation in the fast expanding ejecta. In addition, the late time spectrum, at over 240 days post-explosion, shows clear evidence for the presence of newly formed dust.

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Section: Comparison With Other Interacting Snementioning

confidence: 87%

Possible evidence of asymmetry in SN 2007rt, a type IIn supernova

Trundle¹,

Pastorello²,

Benetti

et al. 2009

A&A

Self Cite

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“…Other SN IIb caught in very early phases do not show this effect (see e.g. SN 2013cu, Gal-Yam et al 2014), or only in the UV and blue bandpasses (see the case of SN 2008ax, Pastorello et al 2008;Roming et al 2009). As discussed in Section 1, the detectability of the initial declining phase is thought to be connected with the radius of the progenitor star.…”

Section: Properties Of the Early-time Light Curvesmentioning

confidence: 98%

“…Direct identification of the progenitor has been possible only in four cases: SN 1993J (a K-type supergiant with initial mass Min ∼13-22 M⊙, which may be a component of an interacting binary system, see e.g. Van Dyk et al 2002;Maund et al 2004;Maund & Smartt 2009;Fox et al 2014), SN 2008ax (a WolfRayet star with Min ∼10-28 M⊙, probably exploded in a binary system, Crockett et al 2008;Pastorello et al 2008;Folatelli et al 2015), SN 2011dh (a yellow supergiant with Min ∼12-15 M⊙, Maund et al 2011;Van Dyk et al 2011Ergon et al 2014), and SN 2013df (see details later). In other cases, analysis of early light curves and/or the interactions with the circumstellar matter (CSM) originating from pre-explosion mass-loss processes offer a chance to constrain the exploding star.…”

Section: Introductionmentioning

confidence: 99%

The continuing story of SN IIb 2013df: new optical and IR observations and analysis

Szalai

Vinkó

Nagy

et al. 2016

Mon. Not. R. Astron. Soc.

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SN 2013df is a nearby Type IIb supernova that seems to be the spectroscopic twin of the well-known SN 1993J. Previous studies revealed many, but not all interesting properties of this event. Our goal was to add new understanding of both the early and late-time phases of SN 2013df. Our spectral analysis is based on 6 optical spectra obtained with the 9.2m Hobby-Eberly Telescope during the first month after explosion, complemented by a near-infrared spectrum. We applied the SYNAPPS spectral synthesis code to constrain the chemical composition and physical properties of the ejecta. A principal result is the identification of "high-velocity" He I lines in the early spectra of SN 2013df, manifest as the blue component of the double-troughed profile at ∼5650Å. This finding, together with the lack of clear separation of H and He lines in velocity space, indicates that both H and He features form at the outer envelope during the early phases. We also obtained ground-based BVRI and g ′ r ′ i ′ z ′ photometric data up to +45 days and unfiltered measurements with the ROTSE-IIIb telescope up to +168 days. From the modelling of the early-time quasi-bolometric light curve, we find M ej ∼ 3.2−4.6 M ⊙ and E kin ∼ 2.6−2.8 × 10 51 erg for the initial ejecta mass and the initial kinetic energy, respectively, which agree well with the values derived from the separate modelling of the light-curve tail. Late-time mid-infrared excess indicates circumstellar interaction starting ∼1 year after explosion, in accordance with previously published optical, X-ray, and radio data.

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“…These are the so-called transitional SNe IIn/Ibn, presenting both narrow He and H lines, with low expansion velocities (∼2000 km s −1 ). In the literature, we could identify three objects with similar spectral characteristics: SN2005la (Pastorello et al 2008), SN2010al and SN2011hw (Smith et al 2012;Pastorello et al 2015), which we include as our comparison sample. iPTF17bkj was detected close to its peak light, at…”

Section: Iptf17bkj (Sn 2017hw): a Transitional Sn Ibn/iinmentioning

confidence: 99%

iPTF Survey for Cool Transients

Adams

Blagorodnova

Kasliwal

et al. 2018

PASP

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We performed a wide-area (2000 deg 2 ) g and I band experiment as part of a two month extension to the Intermediate Palomar Transient Factory. We discovered 36 extragalactic transients including iPTF17lf, a highly reddened local SN Ia, iPTF17bkj, a new member of the rare class of transitional Ibn/IIn supernovae, and iPTF17be, a candidate luminous blue variable outburst. We do not detect any luminous red novae and place an upper limit on their rate. We show that adding a slow-cadence I band component to upcoming surveys such as the Zwicky Transient Facility will improve the photometric selection of cool and dusty transients.

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Massive stars exploding in a He-rich circumstellar medium - II. The transitional case of SN 2005la

Cited by 86 publications

References 52 publications

Possible evidence of asymmetry in SN 2007rt, a type IIn supernova

Possible evidence of asymmetry in SN 2007rt, a type IIn supernova

The continuing story of SN IIb 2013df: new optical and IR observations and analysis

iPTF Survey for Cool Transients

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