2010A&A...510A.108P


Query : 2010A&A...510A.108P

2010A&A...510A.108P - Astronomy and Astrophysics, volume 510, A108-108 (2010/2-1)

VLT spectropolarimetry of the optical transient in NGC 300. Evidence of asymmetry in the circumstellar dust.

PATAT F., MAUND J.R., BENETTI S., BOTTICELLA M.T., CAPPELLARO E., HARUTYUNYAN A. and TURATTO M.

Abstract (from CDS):

We study possible signs of asymmetry in the bright optical transient in NGC 300, to obtain independent information about the explosion mechanism, the progenitor star and its circumstellar environment. Using VLT-FORS1, we obtained low-resolution optical linear spectropolarimetry of NGC 300 OT2008-1 on two epochs, 48 and 55 days after the discovery, covering the spectral range 3600-9330Å. The data exhibit a continuum polarization at a very significant level. At least two separate components are identified. The first is characterized by both a strong wavelength dependency and a constant position angle (68.6±0.3 degrees), which is parallel to the local spiral arm of the host galaxy. The latter is aligned along a completely different position angle (151.3±0.4). While the former is identified as arising in the interstellar dust associated with NGC 300, the latter is most likely caused by continuum polarization by dust scattering in the circumstellar environment. No line depolarization is detected in correspondence to the most intense emission lines, disfavoring electron scattering as the source of intrinsic polarization. This implies that there is a very small deviation from symmetry in the continuum-forming region. Given the observed level of intrinsic polarization, the transient must be surrounded by a significant amount of dust (≥4x10–5M), asymmetrically distributed within a few thousand AU. This probably implies that one or more asymmetric outflow episodes took place during the past history of the progenitor.

Abstract Copyright:

Journal keyword(s): supernovae: general - ISM: general - dust, extinction - globular clusters: individual: NGC 300 - techniques: spectroscopic - techniques: polarimetric

Simbad objects: 13

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Number of rows : 13
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 NAME NGC 300 OT2008-1 ev 00 54 34.16 -37 38 28.6           ~ 119 1
2 NGC 300 GiG 00 54 53.4465638304 -37 41 03.168402396 8.83 8.69 8.13 7.46   ~ 1437 2
3 SN 2001el SN* 03 44 30.60 -44 38 23.4   12.81       SNIa 255 1
4 SN 1987A SN* 05 35 28.020 -69 16 11.07           SNIIpec 4785 2
5 V* V838 Mon No* 07 04 04.8221494992 -03 50 50.648894412       15.181 14.51 M10+B3V 408 0
6 SN 2006X SN* 12 22 53.93 +15 48 32.0     15.3     SNIa 310 1
7 NAME M85 OT2006-1 No* 12 25 23.82 +18 10 56.2     19.30     ~ 63 1
8 * eta Cen Be* 14 35 30.4241610 -42 09 28.170782 1.30 2.12 2.31 2.41 2.59 B2Ve 334 0
9 IRC +10420 pA* 19 26 48.0979492536 +11 21 16.758531216   13.98 11.66     F8Ia+e 471 0
10 V* V1974 Cyg No* 20 30 31.6546001712 +52 37 50.837478240           ~ 566 0
11 SN 2008S ev 20 34 45.33 +60 05 58.4   19.89 18.79 17.93   SNIIn? 230 1
12 NGC 6946 H2G 20 34 52.332 +60 09 13.24   10.5       ~ 2431 2
13 Feige 110 HS* 23 19 58.3996844256 -05 09 56.171142864 10.360 11.45 11.50 11.970 12.145 sdO8VIIIHe5 612 1

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2023.02.09-10:21:53

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