Results 21 to 30 of about 193 (77)

An automated search for transiting exocomets [PDF]

Monthly Notices of the Royal Astronomical Society, 2019
This paper discusses an algorithm for detecting single transits in photometric time-series data. Specifically, we aim to identify asymmetric transits with ingress that is more rapid than egress, as expected for cometary bodies with a significant tail ...
Wyatt, Mark C., Hodgkin, Simon T., Hope, Greg, Kennedy, Grant M.   +3 more
core   +7 more sources

The Transiting Exocomets in the HD 172555 System [PDF]

, 2017
The Earth is thought to have formed dry, in a part of the Solar Nebula deficient in organic material, and to have acquired its organics and water through bombardment by minor bodies.
Kamp, I., Roberge, Aki, Riviere-Marichalar, Pablo, Brown, Alexander, Brown, A., Riviere-Marichalar, P., Welsh, B., Welsh, Barry, Kamp, Inga, Roberge, A., Kamp, Inga; id_orcid, Grady, C. A.   +11 more
core   +5 more sources

Follow-up of three exocomet-host candidates

Astronomy & Astrophysics
Context. Exocomets are small bodies that evaporate when they approach their host star. They can be detected based on the variability of non-photospheric features using spectroscopy and/or asymmetric transits in time-series photometry.
Muñoz-Cutanda P., Rebollido I., Montesinos B., Cruz P., Absil O., Ertel S.   +5 more
doaj   +3 more sources

Interstellar objects and exocomets

In this chapter we review our knowledge of our galaxy's cometary population outside our Oort Cloud - exocomets and Interstellar Objects (ISOs). We start with a brief overview of planetary system formation, viewed as a general process around stars.
Fitzsimmons, Alan, Pfalzner, Susanne, Meech, Karen J., Matrà, Luca   +3 more
core   +3 more sources

Detection of Exocometary CO within the 440 Myr Old Fomalhaut Belt: A Similar CO+CO2 Ice Abundance in Exocomets and Solar System Comets

Astrophysical Journal, 2017
Recent Atacama Large Millimeter/submillimeter Array observations present mounting evidence for the presence of exocometary gas released within Kuiper Belt analogs around nearby main-sequence stars.
Meredith A Macgregor, Paul Kalas, Grant M Kennedy   +2 more
exaly   +3 more sources

Abundances of refractory ions in Beta Pictoris exocomets

Astronomy & Astrophysics
International audienceβ Pictoris is a young A5V star known for harbouring a large number of cometary-like objects (or exocomets) that frequently transit the star and create variable absorption signatures in its spectrum.
T. Vrignaud, F. Kiefer, P. A. Strøm, Kiefer, F., Strøm, P. A., A. Lecavelier des Etangs, Vrignaud, T., Lecavelier des Etangs, A.   +7 more
core   +4 more sources

Exocomets of

Astronomy & Astrophysics
Context. The young β Pictoris system has been monitored with high-resolution optical spectrographs for decades. These observations have revealed strongly variable stochastic absorption in the Ca II H&K lines attributed to infalling cometary bodies. Aims.
H. J. Hoeijmakers, Jaworska, K. P., K. P. Jaworska, Prinoth, B., B. Prinoth, Hoeijmakers, H. J.   +5 more
core   +3 more sources

Population of excited levels of Fe+, Ni+, and Cr+ in exocomets’ gaseous tails

Astronomy and Astrophysics
International audienceThe star β Pictoris is widely known for harbouring a large population of exocomets, which create variable absorption signatures in the stellar spectrum as they transit the star. Although the physical and chemical properties of these
A Lecavelier Des Étangs
exaly   +2 more sources

Observations of Exocomets. [PDF]

Space Sci Rev
Abstract Active small bodies in extrasolar systems, the extrasolar analogues of Solar System comets, provide insights into the orbital evolution and physical processes shaping planetary systems. Since the discovery of exocomets around $\beta $
Korth J, Norazman A, Bendahan-West R, Kennedy G, Madurga Favieres C, Iglesias D, Shubina O, Xu S, Roth NX.   +8 more
europepmc   +3 more sources

Upper limits on CN from exocomets transiting β Pictoris

Astronomy & Astrophysics
Context. The young (23 Myr) nearby (19.4 pc) star β Pictoris hosts an edge-on debris disk with two gas giant exoplanets in orbit around it. Many transient absorption features have been detected in the rotationally broadened stellar lines, which are ...
Brandeker, A., Mooij, E. de; id_orcid, F. Kiefer, Kiefer, F., A. Fitzsimmons, M. A. Kenworthy, Fitzsimmons, A., A. Brandeker, Kenworthy, M. A., E. de Mooij, Opitom, C., C. Opitom   +11 more
core   +3 more sources