A large topographic feature on the surface of the trans-Neptunian object (307261) 2002 MS4 measured from stellar occultations
Özet
Context. The physical characterization of trans-Neptunian objects is essential for improving our understanding of the formation and evolution of our Solar System. Stellar occultation is a ground-based technique that can be successfully used to determine some of the TNOs' fundamental physical properties with high precision, such as size and shape. Aims. This work is aimed at constraining the size, shape, and geometric albedo of the dwarf planet candidate (307261) 2002 MS4 through the analysis of nine stellar occultation events. Using multichord detection, we also study the object's topography by analyzing the obtained limb and residuals between the observed chords and the best-fit ellipse. Metods. We predicted and organized the observational campaigns of nine stellar occultations by 2002 MS4 between 2019 and 2022, resulting in two single-chord events, four double-chord detections, and three events with between 3 and 61 positive chords. We derived the occultation light curves using differential aperture photometry, from which the star ingress and egress instants were calculated. Using 13 selected chords from the 8 August 2020 event, we determined the global elliptical limb of 2002 MS4. The best-fit ellipse, combined with the object's rotational information from the literature, sets constraints on the object's size, shape, and albedo. Additionally, we developed a new method to characterize the topography features on the object's limb. Results. The global limb has a semi-major axis of a' = 412 +/- 10 km, a semi-minor axis of b'= 385 +/- 17 km, and the position angle of the minor axis is 121 degrees +/- 16 degrees. From this instantaneous limb, we obtained 2002 MS4's geometric albedo of p(V) = 0.1 +/- 0.025, using HV = 3.63 +/- 0.05 mag and a projected area-equivalent diameter of 796 +/- 24 km. Significant deviations from the fitted ellipse in the northernmost limb were detected from multiple sites, highlighting three distinct topographic features: one 11 km depth depression, followed by a 25(-5)(+4) km height elevation next to a crater-like depression, with an extension of 322 +/- 39 km and 45.1 +/- 1.5 km deep. Conclusions. Our results indicate the presence of an object that is approximate to 138 km smaller in diameter than that derived from thermal data, possibly indicating the presence of a thus-far unknown satellite. However, within the error bars, the geometric albedo in the V-band is in agreement with the results published in the literature, even with the radiometric-derived albedo. This stellar occultation has allowed for the first multichord measurement of a large topography in a TNO.
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Rommel, F., Braga-Ribas, F., Ortiz, J., Sicardy, B., Santos-Sanz, P., Desmars, J., Camargo, J., Vieira-Martins, R., Assafin, M., Morgado, B., Boufleur, R., Benedetti-Rossi, G., Gomes-Júnior, A., Fernández-Valenzuela, E., Holler, B., Souami, D., Duffard, R., Margoti, G., Vara-Lubiano, M., … Wake, D. (2023). A large topographic feature on the surface of the trans-Neptunian object (307261) 2002 MS4 measured from stellar occultations. ASTRONOMY & ASTROPHYSICS, 678. https://doi.org/10.1051/0004-6361/202346892
BibTeX
@article{rommel2023-78017,
author = {Rommel, F.L. and Braga-Ribas, F. and Ortiz, J.L. and Sicardy, B. and Santos-Sanz, P. and Desmars, J. and Camargo, J.I.B. and Vieira-Martins, R. and Assafin, M. and Morgado, B.E. and Boufleur, R.C. and Benedetti-Rossi, G. and Gomes-Júnior, A.R. and Fernández-Valenzuela, E. and Holler, B.J. and Souami, D. and Duffard, R. and Margoti, G. and Vara-Lubiano, M. and Lecacheux, J. and Plouvier, J.L. and Morales, N. and Maury, A. and Fabrega, J. and Ceravolo, P. and Jehin, E. and Albanese, D. and Mariey, H. and Cikota, S. and Ruždjak, D. and Cikota, A. and Szakáts, R. and Baba Aissa, D. and Gringahcene, Z. and Kashuba, V. and Koshkin, N. and Zhukov, V. and Fişek, S. and Çakir, O. and Özer, S. and Schnabel, C. and Schnabel, M. and Signoret, F. and Morrone, L. and Santana-Ros, T. and Pereira, C.L. and Emilio, M. and Burdanov, A.Y. and De Wit, J. and Barkaoui, K. and Gillon, M. and Leto, G. and Frasca, A. and Catanzaro, G. and Sanchez, R. Zanmar and Tagliaferri, U. and Di Sora, M. and Isopi, G. and Krugly, Y. and Slyusarev, I. and Chiorny, V. and Mikuž, H. and Bacci, P. and Maestripieri, M. and Grazia, M.D. and De La Cueva, I. and Yuste-Moreno, M. and Ciabattari, F. and Kozhukhov, O.M. and Serra-Ricart, M. and Alarcon, M.R. and Licandro, J. and Masi, G. and Bacci, R. and Bosch, J.M. and Behem, R. and Prost, J.-P. and Renner, S. and Conjat, M. and Bachini, M. and Succi, G. and Stoian, L. and Juravle, A. and Carosati, D. and Gowe, B. and Carrillo, J. and Zheleznyak, A.P. and Montigiani, N. and Foster, C.R. and Mannucci, M. and Ruocco, N. and Cuevas, F. and Di Marcantonio, P. and Coretti, I. and Iafrate, G. and Baldini, V. and Collins, M. and Pál, A. and Csák, B. and Fernández-Garcia, E. and Castro-Tirado, A.J. and Hudin, L. and Madiedo, J.M. and Anghel, R.M. and Calvo-Fernández, J.F. and Valvasori, A. and Guido, E. and Gherase, R.M. and Kamoun, S. and Fafet, R. and Sánchez-González, M. and Curelaru, L. and Vîntdevarǎ, C.D. and Danescu, C.A. and Gout, J.-F. and Schmitz, C.J. and Sota, A. and Belskaya, I. and Rodríguez-Marco, M. and Kilic, Y. and Frappa, E. and Klotz, A. and Lavayssière, M. and Oliveira, J. Marques and Popescu, M. and Mammana, L.A. and Fernández-Lajús, E. and Schmidt, M. and Hopp, U. and Komžík, R. and Pribulla, T. and Tomko, D. and Husárik, M. and Erece, O. and Eryilmaz, S. and Buzzi, L. and Gährken, B. and Nardiello, D. and Hornoch, K. and Sonbas, E. and Er, Hüseyin and Burwitz, V. and Sybilski, P. Waldemar and Bykowski, W. and Müller, T.G. and Ogloza, W. and Gonçalves, R. and Ferreira, J.F. and Ferreira, M. and Bento, M. and Meister, S. and Bagiran, M.N. and Tekeş, M. and Marciniak, A. and Moravec, Z. and Delinčák, P. and Gianni, G. and Casalnuovo, G.B. and Boutet, M. and Sanchez, J. and Klemt, B. and Wuensche, N. and Burzynski, W. and Borkowski, M. and Serrau, M. and Dangl, G. and Klös, O. and Weber, C. and Urbaník, M. and Rousselot, L. and Kubánek, J. and André, P. and Colazo, C. and Spagnotto, J. and Sickafoose, A.A. and Hueso, R. and Sánchez-Lavega, A. and Fisher, R.S. and Rengstorf, A.W. and Perelló, C. and Dascalu, M. and Altan, M. and Gazeas, K. and De Santana, T. and Sfair, R. and Winter, O.C. and Kalkan, S. and Canales-Moreno, O. and Trigo-Rodríguez, J.M. and Tsamis, V. and Tigani, K. and Sioulas, N. and Lekkas, G. and Bertesteanu, D.N. and Dumitrescu, V. and Wilberger, A.J. and Barnes, J.W. and Fieber-Beyer, S.K. and Swaney, R.L. and Fuentes, C. and Mendez, R.A. and Dumitru, B.D. and Flynn, R.L. and Wake, D.A.},
title = {A large topographic feature on the surface of the trans-Neptunian object (307261) 2002 MS4 measured from stellar occultations},
journal = {ASTRONOMY & ASTROPHYSICS},
year = {2023},
volume = {678},
issn = {0004-6361},
doi = {10.1051/0004-6361/202346892},
url = {https://akademik.atauni.edu.tr/yayinlar/78017-a-large-topographic-feature-on-the-surface-of-the-trans-neptunian-object-307261}
}