Cotton, Daniel V, Marshall, Jonathan P, Frisch, Priscilla C, Kedziora-Chudzer, Lucyna, Bailey, Jeremy, Bott, Kimberly, Wright, Duncan J, Wyatt, Mark C and Kennedy, Grant M. (2019) The wavelength dependence of interstellar polarization in the Local Hot Bubble. Monthly Notices of the Royal Astronomical Society, 483 (3). pp. 3636-3646. doi:10.1093/mnras/sty3318 ISSN 1745-3933.

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Abstract

The properties of dust in the interstellar medium (ISM) nearest the Sun are poorly understood because the low column densities of dust toward nearby stars induce little photometric reddening, rendering the grains largely undetectable. Stellar polarimetry offers one pathway to deducing the properties of this diffuse material. Here we present multi-wavelength aperture polarimetry measurements of seven bright stars chosen to probe interstellar polarization near the edge of the Local Hot Bubble (LHB) - an amorphous region of relatively low-density interstellar gas and dust extending ˜70-150 pc from the Sun. The measurements were taken using the HIgh Precision Polarimetric Instrument (HIPPI) on the 3.9-m Anglo-Australian Telescope. HIPPI is an aperture stellar polarimeter with a demonstrated sensitivity of 4.3 parts-per-million (ppm). Of the stars observed two are polarized to a much greater degree than the others; they have a wavelength of maximum polarization (λmax) of ˜550 ± 20 nm - similar to that of stars beyond the LHB - and we conclude that they are in the wall of the LHB. The remaining five stars have polarizations of ˜70-160 ppm, of these four have a much bluer λmax, ˜350 ± 50 nm. Bluer values of λmax may indicate grains shocked during the evolution of the Loop I Superbubble. The remaining star, HD 4150 is not well fit by a Serkowski curve, and may be intrinsically polarized.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH):	Interstellar matter, Polarimetry
Journal or Publication Title:	Monthly Notices of the Royal Astronomical Society
Publisher:	Oxford University Press
ISSN:	1745-3933
Official Date:	1 March 2019
Dates:	Date Event 1 March 2019 Published 6 December 2018 Available 27 November 2018 Accepted
Volume:	483
Number:	3
Page Range:	pp. 3636-3646
DOI:	10.1093/mnras/sty3318
Status:	Peer Reviewed
Publication Status:	Published
Reuse Statement (publisher, data, author rights):	This is a pre-copyedited, author-produced version of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record Daniel V Cotton, Jonathan P Marshall, Priscilla C Frisch, Lucyna Kedziora-Chudzer, Jeremy Bailey, Kimberly Bott, Duncan J Wright, Mark C Wyatt, Grant M Kennedy; The wavelength dependence of interstellar polarization in the Local Hot Bubble, Monthly Notices of the Royal Astronomical Society, Volume 483, Issue 3, 1 March 2019, Pages 3636–3646, https://doi.org/10.1093/mnras/sty3318 is available online at: https://doi.org/10.1093/mnras/sty3318
Access rights to Published version:	Restricted or Subscription Access
Date of first compliant deposit:	4 February 2019
Date of first compliant Open Access:	4 February 2019
RIOXX Funder/Project Grant:	Project/Grant ID RIOXX Funder Name Funder ID MOST104- 2628-M-001-004-MY3 Ministry of Science and Technology, Taiwan http://dx.doi.org/10.13039/501100004663 MOST107-2119-M-001-031-MY3 Ministry of Science and Technology, Taiwan http://dx.doi.org/10.13039/501100004663 AS-IA-106-M03 Academia Sinica http://dx.doi.org/10.13039/501100001869
Open Access Version:	ArXiv

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