2018A&A...615A..42C


Query : 2018A&A...615A..42C

2018A&A...615A..42C - Astronomy and Astrophysics, volume 615A, 42-42 (2018/7-1)

Spectropolarimetry of Galactic stars with anomalous extinction sightlines.

CIKOTA A., HOANG T., TAUBENBERGER S., PATAT F., MAZZEI P., COX N.L.J., ZELAYA P., CIKOTA S., TOMASELLA L., BENETTI S. and RODEGHIERO G.

Abstract (from CDS):

Highly reddened type Ia supernovae (SNe Ia) with low total-to-selective visual extinction ratio values, RV, also show peculiar linear polarization wavelength dependencies with peak polarizations at short wavelengths (λmax≤0.4µm). It is not clear why sightlines to SNe Ia display such different continuum polarization profiles from interstellar sightlines in the Milky Way with similar RV values. We investigate polarization profiles of a sample of Galactic stars with low RV values, along anomalous extinction sightlines, with the aim to find similarities to the polarization profiles that we observe in SN Ia sightlines. We undertook spectropolarimetry of 14 stars, used archival data for 3 additional stars, and ran dust extinction and polarization simulations (by adopting the picket-fence alignment model) to infer a simple dust model (size distribution, alignment) that can reproduce the observed extinction and polarization curves. Our sample of Galactic stars with low RV values and anomalous extinction sightlines displays normal polarization profiles with an average λmax∼0.53µm, and is consistent within 3σ to a larger coherent sample of Galactic stars from the literature. Despite the low RV values of dust toward the stars in our sample, the polarization curves do not show any similarity to the continuum polarization curves observed toward SNe Ia with low RV values. There is a correlation between the best-fit Serkowski parameters K and λmax, but we did not find any significant correlation between RV and λmax. Our simulations show that the K-λmax relationship is an intrinsic property of polarization. Furthermore, we have shown that in order to reproduce polarization curves with normal λmax and low RV values, a population of large (a≥0.1µm) interstellar silicate grains must be contained in the dust composition.

Abstract Copyright: © ESO 2018

Journal keyword(s): polarization - ISM: general - dust, extinction - supernovae: general - galaxies: ISM

VizieR on-line data: <Available at CDS (J/A+A/615/A42): sources.dat files/*>

Status at CDS : Objects in title, abstract, text, figures, and all or part of small table(s) being processed in SIMBAD.

Simbad objects: 45

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Number of rows : 45
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 V* AO Cas SB* 00 17 43.0633133256 +51 25 59.116450728 5.04 6.01 6.14     O9.2II+O8V((f)) 322 0
2 SN 2005hk SN* 00 27 50.89 -01 11 53.3   15.92       SNIax 209 1
3 HD 2619 * 00 30 28.3298416296 +65 16 19.764470208 8.44 8.78 8.33     B0.5III 40 0
4 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 10309 1
5 HD 14069 * 02 16 45.1936420248 +07 41 10.637150532   9.21 9.06     A0 44 0
6 HD 14357 * 02 21 10.4369424696 +56 51 56.340040320 8.31 8.83 8.4988 8.21 8.0630 B2.0I 73 0
7 SN 2002fk SN* 03 22 05.71 -15 24 03.2     15.7     SNIa 91 1
8 HD 21291 s*b 03 29 04.1328896160 +59 56 25.201164588 4.40 4.63 4.22 3.84 3.46 B9Ia 285 0
9 * 1 Cam Pu* 04 32 01.84227 +53 54 39.0450 6.41 5.876 5.772     B0III+B0IV/V 98 1
10 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3971 0
11 HD 37061 Or* 05 35 31.3649044920 -05 16 02.582064192 6.44 7.09 6.83     O9.5V 344 0
12 * chi01 Ori RS* 05 54 22.9829893 +20 16 34.222038 5.08 5.00 4.40 3.90 3.59 G0V 824 0
13 * 9 Gem s*b 06 16 58.7058631680 +23 44 27.284070336 6.31 6.70 6.25 5.78 5.38 B3Iab 233 0
14 HD 54439 * 07 08 23.1959923944 -11 51 08.558414028 6.98 7.73 7.68 8.58   B2/3II 55 0
15 SN 2008fp SN* 07 16 32.60 -29 19 31.7           SNIa 61 1
16 HD 73420 * 08 36 37.1155939800 -44 04 48.163266624 8.23 9.41 9.33 9.47   B2II/III 38 0
17 HD 78785 * 09 08 24.0914984616 -46 15 13.238099388 8.70 9.11 8.60 8.04 7.65 B2II 41 0
18 SN 2003W SN* 09 46 49.48 +16 02 37.6     17.3     SNIa 65 1
19 SN 2014J SN* 09 55 42.12 +69 40 25.9           SNIa 368 1
20 SN 2002bo SN* 10 18 06.51 +21 49 41.7   13.95       SNIa 297 1
21 SN 2010ev SN* 10 25 28.99 -39 49 51.2           SNIa 34 1
22 HD 90508 ** 10 28 03.88212 +48 47 05.6554 7.09 7.03   5.98   F9-V 234 1
23 HD 96042 Em* 11 03 40.5641092464 -59 25 59.086384104 7.63 8.41 8.23 9.26   B1V+ 66 0
24 NAME Cha 1 MoC 11 06 48 -77 18.0           ~ 1070 1
25 SN 2011ae SN* 11 54 49.25 -16 51 43.6           SNIa 13 1
26 SN 2006X SN* 12 22 53.93 +15 48 32.0     15.3     SNIa 304 1
27 SN 1986G SN* 13 25 36.46 -43 01 53.6   12.45 11.44     SNIapec 396 1
28 SN 2007af SN* 14 22 21.03 -00 23 37.6     15.4     SNIa 150 1
29 HD 137569 pA* 15 26 20.8172517192 +14 41 36.321520992   7.86 7.91     B9Iab:p 98 0
30 HD 141318 Pu* 15 51 06.8041626360 -55 03 19.928655972 5.13 5.756 5.767 7.08   B2III 83 0
31 HD 144579 PM* 16 04 56.7936202756 +39 09 23.434584550 7.60 7.40 6.67 6.04 5.63 G8V 262 1
32 HD 152245 * 16 54 00.4797621624 -40 31 58.152058500 7.71 8.49 8.37     B0Ib 54 0
33 HD 152853 * 16 58 07.9288825488 -45 58 56.456219568 7.35 8.05 7.94 8.78   B2III 42 0
34 HD 154445 * 17 05 32.2587926880 -00 53 31.437713328 5.10 5.73 5.61 5.39 5.34 B1V 248 0
35 HD 168021 ** 18 18 43.2576402120 -18 37 10.754919264 6.46 7.08 6.86 7.64   B0Ia+B0.2II 82 0
36 * tet Cyg PM* 19 36 26.5343563 +50 13 15.964573 4.83 4.86 4.48 4.13 3.92 F3+V 339 1
37 HD 344880 * 19 45 42.3144984240 +23 59 04.029288900 9.76 9.96 9.34     B0.5III:nn 29 0
38 HD 226868 HXB 19 58 21.6757355952 +35 12 05.784512688 9.38 9.72 8.91 8.42   O9.7Iabpvar 4119 0
39 HD 194092 * 20 22 05.4431483952 +40 59 08.173612896 7.66 8.37 8.28     B0.5III 54 0
40 * 55 Cyg s*b 20 48 56.2915921440 +46 06 50.883645024 4.83 5.28 4.86 4.41 4.10 B4Ia 483 0
41 BD+45 3341 * 20 57 02.6789000784 +46 32 44.686579956 8.73 9.11 8.73     B1II 29 0
42 HD 217035 bC* 22 56 30.941664 +62 52 06.31128 7.66         B0.5Vn+B0.5V 96 0
43 HD 218323 * 23 05 56.7066746184 +64 17 42.546510960 7.82 8.11 7.6     B5 59 0
44 SN 2007le SN* 23 38 48.45 -06 31 21.7     15.2     SNIa 118 1
45 SN 2007fb SN* 23 56 52.37 +05 30 31.8     15.7     SNIa 32 1

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2022.08.08-04:19:52

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