Zobrazeno 1 - 10
of 478
pro vyhledávání: '"Kama M"'
Publikováno v:
A&A 686, A120 (2024)
In protoplanetary disks, atomic carbon is expected to originate from the PDR at the disk surface where CO is dissociated by UV photons coming from the stellar, or external interstellar, radiation field. Even though atomic carbon has been detected in
Externí odkaz:
http://arxiv.org/abs/2403.05042
Autor:
Guzman-Diaz, J., Montesinos, B., Mendigutia, I., Kama, M., Meeus, G., Vioque, M., Oudmaijer, R. D., Villaver, E.
Publikováno v:
A&A 671, A140 (2023)
(Abridged) The stellar metallicity, [M/H], may have important implications for planet formation. In particular, Kama et al. proposed that the deficit of refractory elements in the surfaces of some Herbig Ae/Be stars (HAeBes) may be linked to the pres
Externí odkaz:
http://arxiv.org/abs/2212.14022
Autor:
Sturm, J. A., McClure, M. K., Harsono, D., Facchini, S., Long, F., Kama, M., Bergin, E. A., van Dishoeck, E. F.
Publikováno v:
A&A 660, A126 (2022)
The composition of planets may be largely determined by the chemical processing and accretion of icy pebbles in protoplanetary disks. Recent observations of protoplanetary disks hint at wide-spread depletion of gaseous carbon. The missing volatile ca
Externí odkaz:
http://arxiv.org/abs/2201.04089
Autor:
Lovell, J. B., Kennedy, G. M., Marino, S., Wyatt, M. C., Ansdell, M., Kama, M., Manara, C. F., Matrà, L., Rosotti, G., Tazzari, M., Testi, L., Williams, J. P.
We observed the K7 class III star NO Lup in an ALMA survey of the 1-3 Myr Lupus association and detected circumstellar dust and CO gas. Here we show that the J = 3-2 CO emission is both spectrally and spatially resolved, with a broad velocity width $
Externí odkaz:
http://arxiv.org/abs/2011.13229
Autor:
Lovell, J. B., Wyatt, M. C., Ansdell, M., Kama, M., Kennedy, G. M., Manara, C. F., Marino, S., Matrà, L., Rosotti, G., Tazzari, M., Testi, L., Williams, J. P.
Class III stars are those in star forming regions without large non-photospheric infrared emission, suggesting recent dispersal of their protoplanetary disks. We observed 30 class III stars in the 1-3 Myr Lupus region with ALMA at ${\sim}856\mu$m, re
Externí odkaz:
http://arxiv.org/abs/2010.12657
Autor:
Kama, M., Trapman, L., Fedele, D., Bruderer, S., Hogerheijde, M. R., Miotello, A., van Dishoeck, E. F., Clarke, C., Bergin, E. A.
Publikováno v:
A&A 634, A88 (2020)
Hydrogen deuteride (HD) rotational line emission can provide reliable protoplanetary disk gas mass measurements, but it is difficult to observe and detections have been limited to three T-Tauri disks. No new data have been available since the \emph{H
Externí odkaz:
http://arxiv.org/abs/1912.11883
Autor:
Kenworthy, M. A., Klaassen, P. D., Min, M., van der Marel, N., Bohn, A. J., Kama, M., Triaud, A., Hales, A., Monkiewicz, J., Scott, E., Mamajek, E. E.
Publikováno v:
A&A 633, A115 (2020)
Our aim was to directly detect the thermal emission of the putative exoring system responsible for the complex deep transits observed in the light curve for the young Sco-Cen star 1SWASP J140747.93-394542.6 (V1400 Cen, hereafter J1407), confirming it
Externí odkaz:
http://arxiv.org/abs/1912.03314
Publikováno v:
A&A 642, L15 (2020)
Volatile molecules are critical to terrestrial planetary habitability, yet difficult to observe directly where planets form at the midplanes of protoplanetary disks. It is unclear whether the inner 1 AU of disks are volatile-poor or if this region is
Externí odkaz:
http://arxiv.org/abs/1910.07345
Autor:
Marino, S., Wyatt, M. C., Kennedy, G. M., Kama, M., Matrà, L., Triaud, A. H. M. J., Henning, Th.
Low mass stars might offer today the best opportunities to detect and characterise planetary systems, especially those harbouring close-in low mass temperate planets. Among those stars, TRAPPIST-1 is exceptional since it has seven Earth-sized planets
Externí odkaz:
http://arxiv.org/abs/1909.09158
Autor:
Favre, C., Ceccarelli, C., López-Sepulcre, A., Fontani, F., Neri, R., Manigand, S., Kama, M., Caselli, P., Al-Edhari, A. Jaber, Kahane, C., Alves, F., Balucani, N., Bianchi, E., Caux, E., Codella, C., Dulieu, F., Pineda, J. E., Sims, I. R., Theulé, P.
We report new interferometric images of cyclopropenylidene, c-C$_3$H$_2$, towards the young protocluster OMC-2 FIR\,4. The observations were performed at 82 and 85 GHz with the NOrthern Extended Millimeter Array (NOEMA) as part of the project Seeds O
Externí odkaz:
http://arxiv.org/abs/1804.07825