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Your search keyword '"Matthew J. Lehner"' showing total 9 results
Start Over Author "Matthew J. Lehner" Publisher iop publishing
9 results on '"Matthew J. Lehner"'

1. FOSSIL. III. Lightcurves of 371 Trans-Neptunian Objects

Author

Edward Ashton, Chan-Kao Chang, Ying-Tung Chen, Matthew J. Lehner, Shiang-Yu Wang, Mike Alexandersen, Young-Jun Choi, Wesley C. Fraser, A. Paula Granados Contreras, Takashi Ito, Youngmin JeongAhn, Jianghui Ji, JJ Kavelaars, Myung-Jin Kim, Samantha M. Lawler, Jian Li, Zhong-Yi Lin, Patryk Sofia Lykawka, Hong-Kyu Moon, Surhud More, Marco A. Muñoz-Gutiérrez, Keiji Ohtsuki, Rosemary E. Pike, Tsuyoshi Terai, Seitaro Urakawa, Fumi Yoshida, Hui Zhang, Haibin Zhao, Ji-Lin Zhou, and (The FOSSIL Collaboration)

Subjects
Trans-Neptunian objects, Light curves, Sky surveys, Astrophysics, QB460-466
Abstract

From the first phase of the high-cadence Formation of the Outer Solar System: an Icy Legacy (FOSSIL) survey, we analyzed lightcurves, ranging from one to four nights in length, of 371 trans-Neptunian objects (TNOs) for periodicity. We found 29 TNOs with periodic lightcurves, one of which is a good candidate for a close/contact binary. Another of the periodic FOSSIL TNOs could potentially have the fastest of all known TNO spin rates, with a period of 1.3 hr. We do not have total confidence in the period and thus plan to obtain a more detailed lightcurve for confirmation. The periodic TNOs have an average rotation period of 11.2 hr, close to the value obtained by Alexandersen et al., which had similar cadence, but different from other surveys. In regards to contention in the literature about whether smaller TNOs are more irregular in shape and thus have larger lightcurve amplitudes, we found that there is a weak correlation between absolute magnitude and lightcurve amplitude in a subset of 194 FOSSIL TNOs, even when using the more appropriate brightest (minimum) absolute magnitude instead of the time-averaged value.

Published
2023
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2. Occultations by small non-spherical trans-neptunian objects. I. A new event simulator for TAOS II

Author

B. Hernández-Valencia, Javier Salinas-Luna, You-Hua Chu, John C. Geary, Mauricio Reyes-Ruiz, J. H. Castro-Chacón, Matthew J. Lehner, Kem H Cook, Timothy Norton, F. I. Alvarez-Santana, Wen Ping Chen, Z. W. Zhang, Ma. T. García-Díaz, J. B. Hernández-Águila, J. C. Carvajal, J. S. Silva, E. Sánchez, Charles Alcock, Chung-Kai Huang, Andrew Szentgyorgyi, Wei-Ling Yen, Mike Alexandersen, Juan Manuel Nuñez, Jj Kavelaars, and Carlos Guerrero

Subjects
Physics, surveys, Space and Planetary Science, Event (relativity), occultations, Astronomy, Astronomy and Astrophysics, Kuiper belt: general, Trans-Neptunian object, digestive system diseases
Abstract

We present a new occultation event simulator for the Trans-Neptunian Automated Occultation Survey (TAOS II). We have developed a method to compute occultation shadows by small objects with non-circular apparent shapes (as may result from an intrinsic morphology or from the projection of a contact binary). The new simulator calculates diffraction features in the occultation shadows, as well as resulting light curves as would be measured by the TAOS II survey system. We include effects such as the spectral type and finite angular size of the occulted star. We find that occultation events, especially by Trans-Neptunian Objects with diameters ~3 km may be misidentified or mischaracterized when not taking non-spherical shapes into account.

Published
2019

3. The TAOS Project: Statistical Analysis of Multi-Telescope Time Series Data

Author

S. L. Marshall, C.-Y. Wen, Megan E. Schwamb, John Rice, K. H. Cook, Dae-Won Kim, Pavlos Protopapas, Shiang-Yu Wang, Charles Alcock, Typhoon Lee, Yong-Ik Byun, I. de Pater, J.-H. Wang, Matthew J. Lehner, S. K. King, Wen Ping Chen, Tim Axelrod, N. K. Coehlo, Zhi-Wei Zhang, and Federica B. Bianco

Subjects
Earth and Planetary Astrophysics (astro-ph.EP), 0303 health sciences, Series (mathematics), Computer science, FOS: Physical sciences, Flux, Astronomy and Astrophysics, 01 natural sciences, Occultation, law.invention, Data set, Telescope, 03 medical and health sciences, Stars, Space and Planetary Science, law, 0103 physical sciences, Time series, 010303 astronomy & astrophysics, Astrophysics - Earth and Planetary Astrophysics, 030304 developmental biology, Remote sensing, Event (probability theory)
Abstract

The Taiwanese-American Occultation Survey (TAOS) monitors fields of up to ~1000 stars at 5 Hz simultaneously with four small telescopes to detect occultation events from small (~1 km) Kuiper Belt Objects (KBOs). The survey presents a number of challenges, in particular the fact that the occultation events we are searching for are extremely rare and are typically manifested as slight flux drops for only one or two consecutive time series measurements. We have developed a statistical analysis technique to search the multi-telescope data set for simultaneous flux drops which provides a robust false positive rejection and calculation of event significance. In this paper, we describe in detail this statistical technique and its application to the TAOS data set., 15 pages, 14 figures. Submitted to PASP

Published
2010

6. Col-OSSOS: The Colors of the Outer Solar System Origins Survey.

Author

Megan E. Schwamb, Wesley C. Fraser, Michele T. Bannister, Michaël Marsset, Rosemary E. Pike, J. J. Kavelaars, Susan D. Benecchi, Matthew J. Lehner, Shiang-Yu Wang, Audrey Thirouin, Audrey Delsanti, Nuno Peixinho, Kathryn Volk, Mike Alexandersen, Ying-Tung Chen, Brett Gladman, Stephen D. J. Gwyn, and Jean-Marc Petit

Published
2019
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