دورية أكاديمية
Trends in Silicates in the β Pictoris Disk
| العنوان: | Trends in Silicates in the β Pictoris Disk |
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| المؤلفون: | Lu, Cicero X., Chen, Christine H., Sargent, B. A., Watson, Dan M., Lisse, Carey M., Green, Joel D., Sitko, Michael L., Mittal, Tushar, Lebouteiller, Vianney, Sloan, G. C., Rebollido, Isabel, Hines, Dean C., Girard, Julien H., Werner, Michael W., Stapelfeldt, Karl R., Wu, Winston, Worthen, Kadin, Lu, Cicero, Chen, Christine, Watson, Dan, Lisse, Carey, Green, Joel, Sitko, Michael, Hines, Dean, Girard, Julien, Werner, Michael, Stapelfeldt, Karl |
| المساهمون: | Space Telescope Science Institute (STSci), Johns Hopkins University Applied Physics Laboratory Laurel, MD (APL), Helsingin yliopisto = Helsingfors universitet = University of Helsinki, Department of Earth and Planetary Science UC Berkeley (EPS), University of California Berkeley (UC Berkeley), University of California (UC)-University of California (UC), Astrophysique Interprétation Modélisation (AIM (UMR7158 / UMR_E_9005 / UM_112)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Jet Propulsion Laboratory (JPL), NASA-California Institute of Technology (CALTECH) |
| المصدر: | ISSN: 0004-637X. |
| بيانات النشر: | HAL CCSD American Astronomical Society |
| سنة النشر: | 2022 |
| المجموعة: | HAL-CEA (Commissariat à l'énergie atomique et aux énergies alternatives) |
| مصطلحات موضوعية: | Debris disks, Silicate grains, Planetary system formation, Exoplanet formation, Planetesimals, Exozodiacal dust, Spectroscopy, Infrared astronomy, [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], [PHYS.ASTR.GA]Physics [physics]/Astrophysics [astro-ph]/Galactic Astrophysics [astro-ph.GA], [PHYS.ASTR.HE]Physics [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE], [PHYS.ASTR.IM]Physics [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM] |
| الوصف: | International audience ; Abstract While β Pic is known to host silicates in ring-like structures, whether the properties of these silicate dust vary with stellocentric distance remains an open question. We re-analyze the β Pictoris debris disk spectrum from the Spitzer Infrared Spectrograph (IRS) and a new Infrared Telescope Facility Spectrograph and Imager spectrum to investigate trends in Fe/Mg ratio, shape, and crystallinity in grains as a function of wavelength, a proxy for stellocentric distance. By analyzing a re-calibrated and re-extracted spectrum, we identify a new 18 μ m forsterite emission feature and recover a 23 μ m forsterite emission feature with a substantially larger line-to-continuum ratio than previously reported. We find that these prominent spectral features are primarily produced by small submicron-sized grains, which are continuously generated and replenished from planetesimal collisions in the disk and can elucidate their parent bodies’ composition. We discover three trends about these small grains: as stellocentric distance increases, (1) small silicate grains become more crystalline (less amorphous), (2) they become more irregular in shape, and (3) for crystalline silicate grains, the Fe/Mg ratio decreases. Applying these trends to β Pic’s planetary architecture, we find that the dust population exterior to the orbits of β Pic b and c differs substantially in crystallinity and shape. We also find a tentative 3–5 μ m dust excess due to spatially unresolved hot dust emission close to the star. From our findings, we infer that the surfaces of large planetesimals are more Fe-rich and collisionally processed closer to the star but more Fe-poor and primordial farther from the star. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| العلاقة: | info:eu-repo/semantics/altIdentifier/arxiv/2205.09138; hal-03862674; https://hal.science/hal-03862674Test; https://hal.science/hal-03862674/documentTest; https://hal.science/hal-03862674/file/Lu_2022_ApJ_933_54.pdfTest; ARXIV: 2205.09138; BIBCODE: 2022ApJ.933.54L |
| DOI: | 10.3847/1538-4357/ac70d1 |
| الإتاحة: | https://doi.org/10.3847/1538-4357/ac70d1Test https://hal.science/hal-03862674Test https://hal.science/hal-03862674/documentTest https://hal.science/hal-03862674/file/Lu_2022_ApJ_933_54.pdfTest |
| حقوق: | http://creativecommons.org/licenses/byTest/ ; info:eu-repo/semantics/OpenAccess |
| رقم الانضمام: | edsbas.5291D34E |
| قاعدة البيانات: | BASE |
| DOI: | 10.3847/1538-4357/ac70d1 |
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