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23 April 2024 |
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Article overview
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Searching for water ice in the coma of interstellar object 2I/Borisov | | Bin Yang
; Michael S. P. Kelley
; Karen J. Meech
; Jacqueline V. Keane
; Silvia Protopapa
; Schelte J. Bus
; | | Date: |
11 Dec 2019 | | Abstract: | Interstellar Objects (ISO) passing through our Solar System offer a rare
opportunity to probe the physical and chemical processes involved in solid body
and planet formation in extrasolar systems. The main objective of our study is
to search for diagnostic absorption features of water ice in the near infrared
(NIR) spectrum of the second interstellar object 2I/2019 Q4 (Borisov) and
compare its ice features to those of the Solar system icy objects. We observed
2I in the NIR on three separate occasions. The first observation was made on
2019 September 19 UT using the SpeX spectrograph at the 3-m IRTF and again on
September 24 UT with the GNIRS spectrograph at the 8-m GEMINI telescope and the
last observation was made on October 09 UT with IRTF. The spectra obtained from
all three nights appear featureless. No absorption features associated with
water ice are detected. Spectral modeling suggests that water grains, if
present, comprise no more than 10% of the coma cross-section. The comet
consistently exhibits a red D-type like spectrum with a spectral slope of about
6% per 100nm, which is similar to that of 1I/’Oumuamua and is comparable to
Solar system comets. | | Source: | arXiv, 1912.5318 | | Services: | Forum | Review | PDF | Favorites | |
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