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The EDIBLES survey V: Line profile variations in the $\lambda\lambda$5797, 6379, and 6614 diffuse interstellar bands as a tool to constrain carrier sizes

Journal
Date Issued
2022
Author(s)
MacIsaac, Heather
•
Cami, Jan
•
Cox, Nick L. J.
•
Farhang, Amin
•
Smoker, Jonathan
•
Elyajouri, Meriem
•
Lallement, Rosine
•
Sarre, Peter J.
•
Cordiner, Martin A.
•
Fan, Haoyu
•
Kulik, Klay
•
Linnartz, Harold
•
Foing, Bernard H.
•
van Loon, Jacco Th.
•
•
Smith, Keith T.
DOI
Description
We thank the anonymous referee for providing us with insightful comments that allowed us to greatly improve this paper. HM, JC, AF and HF acknowledge support from an NSERC Discovery Grant. JC, AF and HF were also supported through a SERB Accelerator Award from West- ern University. This work is based on observations collected at the European Organisation for Astronomical Research in the Southern Hemisphere under ESO programme 194.C-0833. This research has made use of NASA’s Astro- physics Data System Bibliographic Services. This research made use of Astropy, (http://www.astropy.org) a community-developed core Python package for Astronomy (Astropy Collaboration 2013, 2018)
Abstract
Context. Several diffuse interstellar bands (DIBs) have profiles with resolved sub-peaks that resemble rotational bands of large molecules. Analysis of these profiles can constrain the sizes and geometries of the DIB carriers, especially if the profiles exhibit clear variations along lines of sight probing different physical conditions. Aims: Using the extensive data set from the ESO Diffuse Interstellar Bands Large Exploration Survey we searched for systematic variations in the peak-to-peak separation of these sub-peaks for three well-known DIBs in lines of sight with a single dominant interstellar cloud. Methods: We used the spectra of twelve single-cloud sight lines to examine the λλ5797, 6379, and 6614 DIB profiles. We measured the peak-to-peak separation in the band profile substructures for these DIBs. We adopted the rotational contour formalism for linear or spherical top molecules to infer the rotational constant for each DIB carrier and the rotational excitation temperature in the sight lines. We compared these to experimentally or theoretically obtained rotational constants for linear and spherical molecules to estimate the DIB carrier sizes. Results: All three DIBs have peak separations that vary systematically between lines of sight, indicating correlated changes in the rotational excitation temperatures. The rotational constant B of the λ6614 DIB was determined independently of the rotational excitation temperature; we derived B6614 = (22.2 ± 8.9) x 10−3 cm−1, consistent with previous estimates. Assuming a similar rotational temperature for the λ6614 DIB carrier and assuming a linear carrier, we found B5797linear = (5.1 ± 2.0) × 10−3 cm−1 and B6379linear = (2.3 ± 0.9) × 10−3 cm−1. If the carriers of those DIBs are spherical species, on the other hand, their rotational constants are half that value, B5797spherical = (2.6 ± 1.0) × 10−3 cm−1 and B6379spherical = (1.1 ± 0.4) × 10−3 cm−1. Conclusions: Systematic variations in the DIB profiles provide the means to constrain the molecular properties. We estimate molecule sizes that range from 7-9 carbon atoms (λ6614 carrier, linear) to 77-114 carbon atoms (λ6379, spherical).
Volume
662
Uri
Url
Issn Identifier
0004-6361
Ads BibCode
2022A&A...662A..24M
Rights
open.access
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