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11 results on '"Linscott, I. R."'

1. A Predicted Dearth of Majority Hypervolatile Ices in Oort Cloud Comets

Author

Lisse, C. M., Gladstone, G. R., Young, L. A., Cruikshank, D. P., Sandford, S. A., Schmitt, B., Stern, S. A., Weaver, H. A., Umurhan, O., Pendleton, Y. J., Keane, J. T., Parker, J. M., Binzel, R. P., Earle, A. M., Horanyi, M., El-Maarry, M., Cheng, A. F., Moore, J. M., McKinnon, W. B., Grundy, W. M., Kavelaars, J. J., Linscott, I. R., Lyra, W., Lewis, B. L., Britt, D. T., Spencer, J. R., Olkin, C. B., McNutt, R. L., Elliott, H. A., Dello-Russo, N., Steckloff, J. K., Neveu, M., and Mousis, O.

Subjects
Astrophysics - Earth and Planetary Astrophysics, Astrophysics - Solar and Stellar Astrophysics
Abstract

We present new, ice species-specific New Horizons/Alice upper gas coma production limits from the 01 Jan 2019 MU69/Arrokoth flyby of Gladstone et al. (2021) and use them to make predictions about the rarity of majority hypervolatile (CO, N$_2$, CH$_4$) ices in KBOs and Oort Cloud comets. These predictions have a number of important implications for the study of the Oort Cloud, including: determination of hypervolatile rich comets as the first objects emplaced into the Oort Cloud; measurement of CO/N$_2$/CH$_4$ abundance ratios in the proto-planetary disk from hypervolatile rich comets; and population statistical constraints on early (< 20 Myr) planetary aggregation driven versus later (> 50 Myr) planetary migration driven emplacement of objects into the Oort Cloud. They imply that the phenomenon of ultra-distant active comets like C/2017K2 (Jewitt et al. 2017, Hui et al. 2018) should be rare, and thus not a general characteristic of all comets. They also suggest that interstellar object 2I/Borisov did not originate in a planetary system that was inordinately CO rich (Bodewits et al. 2020), but rather could have been ejected onto an interstellar trajectory very early in its natal system's history., Comment: 16 Pages, 2 Figures, 1 Table; accepted for Publication in PSJ 14-Mar-2022

Published
2022

2. A Near Surface Temperature Model of Arrokoth

Author

Umurhan, O. M., Grundy, W. M., Bird, M. K., Beyer, R., Keane, J. T., Linscott, I. R., Birch, S., Bierson, C., Young, L. A., Stern, S. A., Lisse, C. M., Howett, C. J. A., Protopapa, S., Spencer, J. R., Binzel, R. P., Mckinnon, W. B., Lauer, T. R., Weaver, H. A., Olkin, C. B., Singer, K. N., Verbiscer, A. J., and Parker, A. H.

Subjects
Astrophysics - Earth and Planetary Astrophysics, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

A near surface thermal model for Arrokoth is developed based on the recently released $10^5$ facet model of the body. This thermal solution takes into account Arrokoth's surface re-radiation back onto itself. The solution method exploits Arrokoth's periodic orbital character to develop a thermal response using a time-asymptotic solution method, which involves a Fourier transform solution of the heat equation, an approach recently used by others. We display detailed thermal solutions assuming that Arrokoth's near surface material's thermal inertia ${\cal I} = $ 2.5 W/m$^{-2}$K$^{-1}$s$^{1/2}$. We predict that at New Horizons' encounter with Arrokoth its encounter hemisphere surface temperatures were $\sim$ 57-59 K in its polar regions, 30-40 K on its equatorial zones, and 11-13 K for its winter hemisphere. Arrokoth's orbitally averaged temperatures are around 30-35 K in its polar regions, and closer to 40 K near its equatorial zones. Thermal reradiation from the surrounding surface amounts to less than 5\% of the total energy budget, while the total energy ensconced into and exhumed out Arrokoth's interior via thermal conduction over one orbit is about 0.5\% of the total energy budget. As a generalized application of this thermal modeling together with other KBO origins considerations, we favor the interpretation that New Horizons' REX instrument's $29 \pm 5$K brightness temperature measurement is consistent with Arrokoth's near surface material's being made of sub-to-few mm sized tholin-coated amorphous \water ice grains with 1 W/m$^{-2}$K$^{-1}$s$^{1/2}$ $< {\cal I} < $10-20 W/m$^{-2}$K$^{-1}$s$^{1/2}$, and which are characterized by an X-band emissivity in the range 0.9 and 1., Comment: Accepted on Feb. 21, 2022 for publication in Planetary Science Journal (PSJ)

Published
2022

5. Overview of the Demonstration and Science Experiments (DSX) Mission

Author

Johnston, W. R., primary, Ginet, G. P., additional, Starks, M. J., additional, McCollough, J. P., additional, Sanchez, J. C., additional, Song, P., additional, Galkin, I. A., additional, Inan, U. S., additional, Lauben, D. S., additional, Tu, J., additional, Reinisch, B. W., additional, Linscott, I. R., additional, Roche, K., additional, Stelmash, S., additional, Allgeier, S., additional, Lambour, R., additional, Schoenberg, J., additional, Gillespie, W., additional, Farrell, W. M., additional, Xapsos, M. A., additional, Roddy, P. A., additional, Lindstrom, C. D., additional, Pedinotti, G. F., additional, Huston, S. L., additional, Albert, J. M., additional, Sinclair, A. J., additional, Davis, L. D., additional, Carilli, J. A., additional, Cooke, D. L., additional, and Parker, C. W., additional

Published
2023
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7. A Predicted Dearth of Bulk Hypervolatile Ices in Oort Cloud Comets

Author

Lisse, C. M., Gladstone, G. R., Young, L. A., Cruikshank, D. P., Sandford, S. A., Schmitt, B., Stern, S. A., Weaver, H. A., Umurhan, O., Pendleton, Y. J., Keane, J. T., Parker, J. M., Binzel, R. P., Earle, A. M., Horanyi, M., El-Maarry, M., Cheng, A. F., Moore, J. M., McKinnon, W. B., Grundy, W. M., Kavelaars, J. J., Linscott, I. R., Lyra, W., Lewis, B. L., Britt, D. T., Spencer, J. R., Olkin, C. B., McNutt, R. L., Elliott, H. A., Dello-Russo, N., Steckloff, J. K., Neveu, M., Mousis, O., Lisse, C. M., Gladstone, G. R., Young, L. A., Cruikshank, D. P., Sandford, S. A., Schmitt, B., Stern, S. A., Weaver, H. A., Umurhan, O., Pendleton, Y. J., Keane, J. T., Parker, J. M., Binzel, R. P., Earle, A. M., Horanyi, M., El-Maarry, M., Cheng, A. F., Moore, J. M., McKinnon, W. B., Grundy, W. M., Kavelaars, J. J., Linscott, I. R., Lyra, W., Lewis, B. L., Britt, D. T., Spencer, J. R., Olkin, C. B., McNutt, R. L., Elliott, H. A., Dello-Russo, N., Steckloff, J. K., Neveu, M., and Mousis, O.

Abstract

We present new, ice species-specific New Horizons/Alice upper gas coma production limits from the 01 Jan 2019 MU69/Arrokoth flyby of Gladstone et al. (2021) and use them to make predictions about the rarity of majority hypervolatile (CO, N$_2$, CH$_4$) ices in KBOs and Oort Cloud comets. These predictions have a number of important implications for the study of the Oort Cloud, including: determination of hypervolatile rich comets as the first objects emplaced into the Oort Cloud; measurement of CO/N$_2$/CH$_4$ abundance ratios in the proto-planetary disk from hypervolatile rich comets; and population statistical constraints on early (< 20 Myr) planetary aggregation driven versus later (> 50 Myr) planetary migration driven emplacement of objects into the Oort Cloud. They imply that the phenomenon of ultra-distant active comets like C/2017K2 (Jewitt et al. 2017, Hui et al. 2018) should be rare, and thus not a general characteristic of all comets. They also suggest that interstellar object 2I/Borisov did not originate in a planetary system that was inordinately CO rich (Bodewits et al. 2020), but rather could have been ejected onto an interstellar trajectory very early in its natal system's history., Comment: 16 Pages, 2 Figures, 1 Table; accepted for Publication in PSJ 14-Mar-2022

Published
2022

8. Detection of Radio Thermal Emission from the Kuiper Belt Object (486958) Arrokoth during the New Horizons Encounter

Author

Bird, M. K., Linscott, I. R., Tyler, G. L., Umurhan, O. M., Beyer, R. A., Grundy, W. M., Lisse, C. M., Hinson, D. P., Paetzold, M., Stern, S. A., Weaver, H. A., Olkin, C. B., Young, L. A., Spencer, J. R., Singer, K. N., Moore, J. M., Gladstone, G. R., DeBoy, C. C., Vincent, M., Porter, S. B., Bird, M. K., Linscott, I. R., Tyler, G. L., Umurhan, O. M., Beyer, R. A., Grundy, W. M., Lisse, C. M., Hinson, D. P., Paetzold, M., Stern, S. A., Weaver, H. A., Olkin, C. B., Young, L. A., Spencer, J. R., Singer, K. N., Moore, J. M., Gladstone, G. R., DeBoy, C. C., Vincent, M., and Porter, S. B.

Abstract

The New Horizons spacecraft encountered the Kuiper Belt object (KBO) Arrokoth (486958), originally designated as 2014 MU69 and formerly called Ultima Thule, on 2019 January 01. At 43.3 au from the Sun and 44.4 au from Earth, this was the most distant spacecraft reconnaissance of a solar system body to date. The Radio Science Experiment (REX) on New Horizons performed radiometry measurements of the KBO's thermal emission at lambda = 4.2 cm in two observation slots, one before (dayside) and one after (nightside) the point of closest approach. Owing to the small size of the target, the intensity of the thermal emission was expected to be only marginally detectable. The KBO was not detected on approach because of unexpectedly large variations in the REX system temperature. A brightness temperature T ( b ) = 29 +/- 5 K was derived for the nightside observation, considerably less than the predicted equilibrium temperature of similar to 50 K derived for Arrokoth on the dayside. A model explaining this day-night contrast is used to constrain the global values of emissivity, thermal inertia, and electrical skin depth of the KBO. In particular, models with small values of thermal inertia and small values of electrical skin depth are excluded. Relatively high values of the effective radio emissivity (E (eff) > 0.8) provide better agreement with the REX observation.

Published
2022

9. Solar System Interiors, Atmospheres, and Surfaces Investigations via Radio Links: Goals for the Next Decade

Author

Massachusetts Institute of Technology. Department of Aeronautics and Astronautics, Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences, Asmar, Sami, Preston, R. A., Vergados, P., Atkinson, D. H., Andert, T., Ando, H., Ao, C. O., Armstrong, J. W., Ashby, N., Barriot, J.-P., Beauchamp, P. M., Bell, D. J., Bender, P. L., Benedetto, M. Di, Bills, B. G., Bird, M. K., Bocanegra-Bahamon, T. M., Botteon, G. K., Bruinsma, S., Buccino, D. R., Cahoy, K. L., Cappuccio, P., Choudhary, R. K., Dehant, V., Dumoulin, C., Durante, D., Edwards, C. D., Elliott, H. M., Ely, T. A., Ermakov, A. I., Ferri, F., Flasar, F. M., French, R. G., Genova, A., Goossens, S. J., Häusler, B., Helled, R., Hinson, D. P., Hofstadter, M. D., Iess, L., Imamura, T., Jongeling, A. P., Karatekin, Ö., Kaspi, Y., Kobayashi, M. M., Komjathy, A., Konopliv, A. S., Kursinski, E. R., Lazio, T. J. W., Maistre, S. Le, Lemoine, F. G., Lillis, R. J., Linscott, I. R., Mannucci, A. J., Marouf, E. A., Marty, J.-C., Matousek, S. E., Matsumoto, K., Mazarico, E. M., Notaro, V., Parisi, M., Park, R. S., Pätzold, M., Peytaví, G. G., Pugh, M. P., Rennó, N. O., Rosenblatt, P., Serra, D., Simpson, R. A., Smith, D. E., Steffes, P. G., Tapley, B. D., Tellmann, S., Tortora, P., Turyshev, S. G., Hoolst, T. Van, Verma, A. K., Watkins, M. M., Williamson, W., Wieczorek, M. A., Withers, P., Yseboodt, M., Yu, N., Zannoni, M., Zuber, M. T., Massachusetts Institute of Technology. Department of Aeronautics and Astronautics, Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences, Asmar, Sami, Preston, R. A., Vergados, P., Atkinson, D. H., Andert, T., Ando, H., Ao, C. O., Armstrong, J. W., Ashby, N., Barriot, J.-P., Beauchamp, P. M., Bell, D. J., Bender, P. L., Benedetto, M. Di, Bills, B. G., Bird, M. K., Bocanegra-Bahamon, T. M., Botteon, G. K., Bruinsma, S., Buccino, D. R., Cahoy, K. L., Cappuccio, P., Choudhary, R. K., Dehant, V., Dumoulin, C., Durante, D., Edwards, C. D., Elliott, H. M., Ely, T. A., Ermakov, A. I., Ferri, F., Flasar, F. M., French, R. G., Genova, A., Goossens, S. J., Häusler, B., Helled, R., Hinson, D. P., Hofstadter, M. D., Iess, L., Imamura, T., Jongeling, A. P., Karatekin, Ö., Kaspi, Y., Kobayashi, M. M., Komjathy, A., Konopliv, A. S., Kursinski, E. R., Lazio, T. J. W., Maistre, S. Le, Lemoine, F. G., Lillis, R. J., Linscott, I. R., Mannucci, A. J., Marouf, E. A., Marty, J.-C., Matousek, S. E., Matsumoto, K., Mazarico, E. M., Notaro, V., Parisi, M., Park, R. S., Pätzold, M., Peytaví, G. G., Pugh, M. P., Rennó, N. O., Rosenblatt, P., Serra, D., Simpson, R. A., Smith, D. E., Steffes, P. G., Tapley, B. D., Tellmann, S., Tortora, P., Turyshev, S. G., Hoolst, T. Van, Verma, A. K., Watkins, M. M., Williamson, W., Wieczorek, M. A., Withers, P., Yseboodt, M., Yu, N., Zannoni, M., and Zuber, M. T.

Published
2022

10. Detection of Radio Thermal Emission from the Kuiper Belt Object (486958) Arrokoth during the New Horizons Encounter

Author

Bird, M. K., primary, Linscott, I. R., additional, Tyler, G. L., additional, Umurhan, O. M., additional, Beyer, R. A., additional, Grundy, W. M., additional, Lisse, C. M., additional, Hinson, D. P., additional, Pätzold, M., additional, Stern, S. A., additional, Weaver, H. A., additional, Olkin, C. B., additional, Young, L. A., additional, Spencer, J. R., additional, Singer, K. N., additional, Moore, J. M., additional, Gladstone, G. R., additional, DeBoy, C. C., additional, Vincent, M., additional, and Porter, S. B., additional

Published
2022
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11. A Predicted Dearth of Majority Hypervolatile Ices in Oort Cloud Comets

Author

Lisse, C. M., primary, Gladstone, G. R., additional, Young, L. A., additional, Cruikshank, D. P., additional, Sandford, S. A., additional, Schmitt, B., additional, Stern, S. A., additional, Weaver, H. A., additional, Umurhan, O., additional, Pendleton, Y. J., additional, Keane, J. T., additional, Parker, J. M., additional, Binzel, R. P., additional, Earle, A. M., additional, Horanyi, M., additional, El-Maarry, M., additional, Cheng, A. F., additional, Moore, J. M., additional, McKinnon, W. B., additional, Grundy, W. M., additional, Kavelaars, J. J., additional, Linscott, I. R., additional, Lyra, W., additional, Lewis, B. L., additional, Britt, D. T., additional, Spencer, J. R., additional, Olkin, C. B., additional, McNutt, R. L., additional, Elliott, H. A., additional, Dello-Russo, N., additional, Steckloff, J. K., additional, Neveu, M., additional, and Mousis, O., additional

Published
2022
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