2005A&A...443..649M


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.03CET04:39:44

2005A&A...443..649M - Astronomy and Astrophysics, volume 443, 649-662 (2005/11-4)

Early and late time VLT spectroscopy of SN 2001el - progenitor constraints for a type Ia supernova.

MATTILA S., LUNDQVIST P., SOLLERMAN J., KOZMA C., BARON E., FRANSSON C., LEIBUNDGUT B. and NOMOTO K.

Abstract (from CDS):

We present early time high-resolution (VLT/UVES) and late time low-resolution (VLT/FORS) optical spectra of the normal type Ia supernova, SN 2001el. The high-resolution spectra were obtained 9 and 2 days before (B-band) maximum light. This was in order to allow the detection of narrow hydrogen and/or helium emission lines from the circumstellar medium of the supernova. No such lines were detected in our data. We therefore use these spectra together with photoionisation models to derive upper limits of 9x10–6M/yr and 5x10–5M/yr for the mass loss rate from the progenitor system of SN 2001el assuming velocities of 10km/s and 50km/s, respectively, for a wind extending to outside at least a few x1015cm away from the supernova explosion site. So far, these are the best Hα based upper limits obtained for a type Ia supernova, and exclude a symbiotic star in the upper mass loss rate regime (so called Mira type stars) from being the progenitor of SN 2001el. The low-resolution spectrum was obtained in the nebular phase of the supernova, ∼400 days after the maximum light, to search for any hydrogen rich gas originating from the supernova progenitor system. However, we see no signs of Balmer lines in our spectrum. Therefore, we model the late time spectra to derive an upper limit of ∼0.03M for solar abundance material present at velocities lower than 1000km/s within the supernova explosion site. According to numerical simulations of Marietta et al. (2000) this is less than the expected mass lost by a subgiant, red giant or a main-sequence secondary star at a small binary separation as a result of the SN explosion. Our data therefore exclude these scenarios as the progenitor of SN 2001el. Finally, we discuss the origin of high velocity Ca II lines previously observed in a few type Ia supernovae before the maximum light. We see both the Ca II IR triplet and the H&K lines in our earliest (-9 days) spectrum at a very high velocity of up to ∼34000km/s. The spectrum also shows a flat-bottomed Si II ``6150Å'' feature similar to the one previously observed in SN 1990N (Leibundgut et al., 1991ApJ...371L..23L) at 14 days before maximum light. We compare these spectral features in SN 2001el to those observed in SN 1984A and SN 1990N at even higher velocities.

Abstract Copyright:

Journal keyword(s): supernovae: general - supernovae: individual: SN 2001el - supernovae: individual: SN 1990N, SN 1984A - circumstellar matter - techniques: spectroscopic

Simbad objects: 19

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Number of rows : 19

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 SN 1572A SN* 00 25 21.5 +64 08 27           B8 1092 1
2 SN 2000cx SN* 01 24 46.19 +09 30 31.3   13.3       SNIap 200 1
3 SN 2003gd SN* 01 36 42.65 +15 44 19.9     13.2     SNIIP 221 2
4 CD-28 595 PM* 01 54 50.2704861570 -27 28 35.740415025   12.06 11.51     ~ 123 0
5 SN 2004dt SN* 02 02 12.342 -00 06 02.10   15.33       SNIa 126 1
6 SN 2001el SN* 03 44 30.60 -44 38 23.4   12.81       SNIa 243 1
7 NGC 1448 GiG 03 44 31.915 -44 38 41.38   11.46   10.24 10.9 ~ 230 0
8 SN 1983S SN* 03 44 34 -44 38.6   14.5 14.5     SNII 15 1
9 SN 2003hn SN* 03 44 36.1 -44 37 49     14.1     SNIIP 52 1
10 SN 1987A SN* 05 35 28.020 -69 16 11.07           SNIIpec 4561 2
11 * mu. Col V* 05 45 59.8953630749 -32 18 23.164726112 3.84 4.90 5.18 5.30 5.57 O9.5V 464 0
12 L 595-22 PM* 05 56 24.7419816722 -27 51 32.362978169   12.31 12.38     sdG 147 0
13 SN 1993J SN* 09 55 24.77476 +69 01 13.7026   10.8 12.0     SNIIb 1279 1
14 SN 2002bo SN* 10 18 06.51 +21 49 41.7   13.95       SNIa 283 1
15 SN 1984A SN* 12 26 55.73 +15 03 17.1   12.40 12.20     SNIa 131 1
16 SN 1994D SN* 12 34 02.395 +07 42 05.70   11.75 12.03     SNIa 522 1
17 SN 1990N SN* 12 42 56.68 +13 15 23.4   12.69 12.62     SNIa 377 1
18 SN 2003du SN* 14 34 35.80 +59 20 03.8   13.46       SNIa 319 1
19 SN 1999ee SN* 22 16 09.40 -36 50 31.5   14.85       SNIa 173 1

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2021.03.03-04:39:44

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