Thermal properties of slowly rotating asteroids: results from a targeted survey

DOI: 
10.1051/0004-6361/201935129
Publication date: 
01/05/2019
Main author: 
Marciniak, A.
IAA authors: 
Duffard, R.
Authors: 
Marciniak, A.;Alí-Lagoa, V.;Müller, T. G.;Szakáts, R.;Molnár, L.;Pál, A.;Podlewska-Gaca, E.;Parley, N.;Antonini, P.;Barbotin, E.;Behrend, R.;Bernasconi, L.;Butkiewicz-Bąk, M.;Crippa, R.;Duffard, R.;Ditteon, R.;Feuerbach, M.;Fauvaud, S.;Garlitz, J.;Geier, S.;Goncalves, R.;Grice, J.;Grześkowiak, I.;Hirsch, R.;Horbowicz, J.;Kamiński, K.;Kamińska, M. K.;Kim, D. -H.;Kim, M. -J.;Konstanciak, I.;Kudak, V.;Kulczak, P.;Maestre, J. L.;Manzini, F.;Marks, S.;Monteiro, F.;Ogłoza, W.;Oszkiewicz, D.;Pilcher, F.;Perig, V.;Polakis, T.;Polińska, M.;Roy, R.;Sanabria, J. J.;Santana-Ros, T.;Skiff, B.;Skrzypek, J.;Sobkowiak, K.;Sonbas, E.;Thizy, O.;Trela, P.;Urakawa, S.;Żejmo, M.;Żukowski, K.
Journal: 
Astronomy and Astrophysics
Refereed: 
Yes
Publication type: 
Article
Volume: 
625
Pages: 
A139
Abstract: 
Context. Earlier work suggests that slowly rotating asteroids should have higher thermal inertias than faster rotators because the heat wave penetrates deeper into the subsurface. However, thermal inertias have been determined mainly for fast rotators due to selection effects in the available photometry used to obtain shape models required for thermophysical modelling (TPM). <BR /> Aims: Our aims are to mitigate these selection effects by producing shape models of slow rotators, to scale them and compute their thermal inertia with TPM, and to verify whether thermal inertia increases with the rotation period. <BR /> Methods: To decrease the bias against slow rotators, we conducted a photometric observing campaign of main-belt asteroids with periods longer than 12 h, from multiple stations worldwide, adding in some cases data from WISE and Kepler space telescopes. For spin and shape reconstruction we used the lightcurve inversion method, and to derive thermal inertias we applied a thermophysical model to fit available infrared data from IRAS, AKARI, and WISE. <BR /> Results: We present new models of 11 slow rotators that provide a good fit to the thermal data. In two cases, the TPM analysis showed a clear preference for one of the two possible mirror solutions. We derived the diameters and albedos of our targets in addition to their thermal inertias, which ranged between 3<SUB>-3</SUB><SUP>+33</SUP> and 45<SUB>-30</SUB><SUP>+60</SUP> J m<SUP>-2</SUP> s<SUP>-1/2</SUP> K<SUP>-1</SUP>. <BR /> Conclusions: Together with our previous work, we have analysed 16 slow rotators from our dense survey with sizes between 30 and 150 km. The current sample thermal inertias vary widely, which does not confirm the earlier suggestion that slower rotators have higher thermal inertias. Full Table A.1 and photometric data from all individual nights are only available at the CDS via anonymous ftp to <A href='http://cdsarc.u-strasbg.fr'>http://cdsarc.u-strasbg.fr</A> (ftp://130.79.128.5) or via <A href='http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/625/A139'>http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/625/A139</A>
Database: 
ADS
SCOPUS
URL: 
https://www.scopus.com/inward/record.uri?eid=2-s2.0-85082711416&doi=10.1051%2f0004-6361%2f201935129&partnerID=40&md5=45b165f5b7f594fbf4f07e08efaef770
ADS Bibcode: 
2019A&A...625A.139M
Keywords: 
minor planets;asteroids: general;techniques: photometric;radiation mechanisms: thermal;Astrophysics - Earth and Planetary Astrophysics