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Testing Mars Trojan Origins via Chi-Square Analysis

POSTER

Abstract

This study employs the Pearson’s chi-square (𝜒²) test to compare visible and near-infrared (VNIR) reflectance spectra of seven asteroids against approximately 11,000 laboratory spectra from meteoritic, terrestrial, synthetic, Apollo, and Luna samples. First, we validate the technique using three well-studied asteroids - (4) Vesta, (6) Hebe, and (19) Fortuna - to confirm previously established spectral matches.We then apply the 𝜒² test to four Mars Trojans: (5261) Eureka, (101429) 1998 VF31, (311999) 2007 NS2, and (385250) 2001 DH47—asteroids whose compositions are currently under speculation. For asteroids potentially affected by space weathering, reddening effects are removed. The top 𝜒² matches for the Mars Trojans show notable spectral similarities with Martian meteorites and minerals formed by igneous processes, suggesting a possible Martian origin for some of the Mars Trojans;however, the possibility that these bodies could be fragments of a disrupted differentiated parent body cannot be ruled out. This paper highlights the value of the 𝜒² test as a preliminary tool for identifying spectral analogs and exploring possible surface compositions of asteroids.

Publication: Bishop, J. L., Lougear, A., Newton, J., et al. 2021, GeCoA, 65, 2875<br><br>Borisov, G., Christou, A., Bagnulo, S., et al. 2017, MNRAS, 466, 489<br><br>Burbine, T. H. 1998, M&PS, 33, 253<br><br>Burbine, T. H., McCoy, T. J., Hinrichs, J. L., & Lucey, P. G. 2006, M&PS, 41, 1139,<br><br>Bus, S. J. & Binzel, R. P. 2002, Icarus, 158, 106<br><br>Cannon, K. M., Parman, S. W., & Mustard, J. F., 2017, Nature, 552, 88<br><br>Castro-Cisneros, J. D., Malhotra, R., & Rosengren, A. J. 2023, ComEE, 4, 372<br><br>Christou, A. A. 2013, Icarus, 224, 144<br><br>Christou, A. A., Borisov, G., Dell'Oro, A., et al. 2017, Icarus, 293, 243<br><br>Christou, A. A., Borisov, G., Dell'Oro, A., et al. 2021, Icarus, 354, 113994<br><br>Cloutis, E. A. 2002, JGRE, 107, 6-1<br><br>Cloutis, E. A. & Gaffey, M. J. 1991, JGR, 96, 22809<br><br>Cloutis, E. A., Hudon, P., Hiroi, T., et al. 2011, Icarus, 216, 309<br><br>Ćuk, M., Christou, A. A., & Hamilton, D. P. 2015, Icarus, 252, 339<br><br>Day, J. M. D., Ash, R. D., Liu, Y., et al. 2009, Nat, 457, 179<br><br>DeMeo, F. E., Binzel, R. P., Slivan, S. M., & Bus, S. J. 2009, Icarus, 202, 160<br><br>DeMeo, F. E., Burt, B. J., Marsset, M., et al. 2022, Icarus, 380, 114971<br><br>Dibb, S. D., Bell, J. F. III, Elkins-Tanton, L. T., & Williams, D. A. 2023, E&SS, 10, e2022EA002694<br><br>Ehlmann, B. L. & Edwards, C. S. 2014, AREPS, 42, 291<br><br><br>Franke, T. M., Ho, T., & Christie, C. A. 2012, AmJE, 33, 448<br><br>Gaffey, M. J. & Gilbert, S. L. 1998, M&PS, 33, 1281<br><br>Glotch, T. D., Edwards, C. S., Yesiltas, M., et al. 2018, JGRE, 123, 2467<br><br>Hazen, R. M., Downs, R. T., Morrison, S. M., et al. 2023, JGRE, 128, e2023JE007865<br><br>Herrin, J. S., Zolensky, M. E., Cartwright, J. E., et al. 2011, 2011LPI, 2806<br><br>Hyodo, R. & Genda, H. 2018, ApJL, 856, L36<br><br>Hyodo, R., Genda, H., Charnoz, S., & Rosenblatt, P. 2017. ApJ, 845, 125<br><br>Jiao, Y., Cheng, B., Huang, Y., et al. 2024, NatAs, https://doi.org/10.1038/s41550-024-02258-z<br><br>Kaplan, H. H., Milliken, R. E., & Alexander, C. M. O'D. 2018, GeoRL, 45, 5274<br><br>Kallemeyn, G. W., Rubin, A. E., & Wasson, J. T. 1991, GeCoA, 55, 881<br><br>Keil, K. 2012, ChEG, 72, 191<br><br>Larson, H. P. & Fink, U. 1975, Icarus 26 420<br><br>Mainzer, A., Bauer, J., Cutri, R., et al. 2019, NASA PDS, NEOWISE Diameters and Albedos V2.0<br><br>Mason, B. 1981, AnMN, 4(1), 12<br><br>McBride, K., McCoy, T., & Reynolds, V. 2007, AnMN, 30(1), 16<br><br>McCord, T. B., Adams, J. B., & Johnson, T. V. 1970, Sci, 168, 1445<br><br>McSween, H. Y. Jr., Taylor, L. A., & Stolper, E. M., 1979, Sci, 204, 1201<br>Meteoritical Bulletin Database 2024, https://www.lpi.usra.edu/meteor/<br>Mikouchi, T. & Miyamoto, M. 2008, 2008LPI, 2297<br><br>Minor Planet Center 2024, https://minorplanetcenter.net/iau/lists/MarsTrojans.html<br><br>Ostrowski D. & Bryson K. 2019, PSS, 165, 148<br><br>Palomba, E., Zinzi, A., Cloutis, E. A., et al. 2009, Icarus, 203, 58<br><br>Pearson, K. 1900, The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science, 50(302), 157<br><br>Polishook, D., Jacobson, D. A., Morbidelli, A., & Aharonson, O. 2017, NatAs, 1, 0179<br><br>Popescu, M., Birlan, M. & Nedelcu, D. A. 2012, A&A, 544, A130<br><br>Rivkin, A. S., Binzel, R. P., Howell, E. S., et al. 2003, Icarus, 165, 349<br><br>Rivkin, A. S., Trilling, D. E., Thomas, C. A., et al. 2007, Icarus, 192, 434<br><br>Ruzicka, A., Grossman, J., Bouvier, A., et al. 2015, M&PS, 50, 149<br><br>Schwarz, C. & Mason, B. 1988, AnMN, 4(1), 31<br><br>Scholl, H., Marzari, F., & Tricarico, P. 2005, Icarus, 175, 397<br><br>Serventi, G. Carli, C., Sgavetti, M., et al. 2013, Icarus, 226, 282<br><br>Sharkey, B. N. L., Reddy, V., Malhotra, R., et al. 2021, ComEE, 2, 231<br><br>Tedesco, E.F., Noah, P. V., Noah, M., & Price S. D. 2004, PDSS, IRAS-A-FPA-3-RDR-IMPS-V6.0<br><br>Thompson, M. S., Morris, R. V., Clemett, S. J., et al. 2020, Icarus, 346, 113775<br><br>Trilling, D. E., Rivkin, A. S., Stansberry, J. A., et al. 2007, Icarus, 192, 442<br><br>Wickhusen, K., Oberst, J. , Christou, A., & Damme, F. 2023, P&SS, 105649<br><br>Wray, J. J., Murchie, S. L., Bishop, J. L., et al. 2016, JGRE, 121, 652<br><br>Yamada, M., Sasaki, S., Nagahara, H., et al. 1999, EP&S, 51, 1255<br><br>Zastrow, A. M. & Glotch, T. D. 2021, GRL, 48, e2020GL092365

Presenters

  • Livneh O Naaman

    Mount Holyoke College

Authors

  • Livneh O Naaman

    Mount Holyoke College

  • Ines A Belkhodja

    Mount Holyoke College

  • Latika Joshi

    Mount Holyoke College

  • Brian J Burt

    Lowell Observatory

  • Thomas H Burbine

    Mount Holyoke College