Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A new precise mass for the progenitor of the Type IIP SN 2008bk   The progenitor of the Type IIP SN 2008bk was discovered in pre-explosion
g'r'i'IYJHKs images, acquired with European Southern Observatory Very Large
Telescope FORS, HAWK-I and ISAAC instruments and the Gemini GMOS-S instrument.
The wealth of pre-explosion observations makes the progenitor of this SN one of
the best studied, since the detection of the progenitor of SN1987A. Previous
analyses of the properties of the progenitor were hampered by the limited
quality of the photometric calibration of the pre-explosion images and the
crowded nature of the field containing the SN. We present new late-time
observations of the site of SN2008bk acquired with identical instrument and
filter configurations as the pre-explosion observations, and confirm that the
previously identified red supergiant star was the progenitor of this SN and has
now disappeared. Image subtraction techniques were used to conduct precise
photometry of the now missing progenitor, independently of blending from any
nearby stars. The nature of the surrounding stellar population and their
contribution to the flux attributed to the progenitor in the pre-explosion
images are probed using HST WFC3 UVIS/IR observations. In comparison with MARCS
synthetic spectra, we find the progenitor was a highly reddened RSG with
luminosity log (L/Lsun)=4.84+/-0.11, corresponding to an initial mass of
Minit=12.9+/-1.7Msun. The temperature of the progenitor was hotter than
previously expected for RSGs (T ~ 4330K), but consistent with new temperatures
derived for RSGs using SED fitting techniques. We show that there is evidence
for significant extinction of the progenitor, possibly arising in the CSM; but
that this dust yields a similar reddening law to dust found in the ISM
(E(B-V)=0.77 with Rv=3.1). [Abridged]

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The categories of this paper are: q-fin
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The categories of this paper are: patt-sol
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The categories of this paper are: q-alg
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The categories of this paper are: plasm-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: gr-qc
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The categories of this paper are: funct-an
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The categories of this paper are: chem-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: eess
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The categories of this paper are: supr-con
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The categories of this paper are: nucl-ex
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The categories of this paper are: cond-mat
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The categories of this paper are: atom-ph
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The categories of this paper are: solv-int
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The categories of this paper are: hep-ph