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202. Rings and gaps in the disc around Elias 24 revealed by ALMA

Author

Dipierro, G, primary, Ricci, L, additional, Pérez, L, additional, Lodato, G, additional, Alexander, R D, additional, Laibe, G, additional, Andrews, S, additional, Carpenter, J M, additional, Chandler, C J, additional, Greaves, J A, additional, Hall, C, additional, Henning, T, additional, Kwon, W, additional, Linz, H, additional, Mundy, L, additional, Sargent, A, additional, Tazzari, M, additional, Testi, L, additional, and Wilner, D, additional

Published
2018
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203. The JCMT Gould Belt Survey: A First Look at the Auriga–California Molecular Cloud with SCUBA-2

Author

Broekhoven-Fiene, H., primary, Matthews, B. C., additional, Harvey, P., additional, Kirk, H., additional, Chen, M., additional, Currie, M. J., additional, Pattle, K., additional, Lane, J., additional, Buckle, J., additional, Francesco, J. Di, additional, Drabek-Maunder, E., additional, Johnstone, D., additional, Berry, D. S., additional, Fich, M., additional, Hatchell, J., additional, Jenness, T., additional, Mottram, J. C., additional, Nutter, D., additional, Pineda, J. E., additional, Quinn, C., additional, Salji, C., additional, Tisi, S., additional, Hogerheijde, M. R., additional, Ward-Thompson, D., additional, Bastien, P., additional, Bresnahan, D., additional, Butner, H., additional, Chrysostomou, A., additional, Coude, S., additional, Davis, C. J., additional, Duarte-Cabral, A., additional, Fiege, J., additional, Friberg, P., additional, Friesen, R., additional, Fuller, G. A., additional, Graves, S., additional, Greaves, J., additional, Gregson, J., additional, Holland, W., additional, Joncas, G., additional, Kirk, J. M., additional, Knee, L. B. G., additional, Mairs, S., additional, Marsh, K., additional, Moriarty-Schieven, G., additional, Mowat, C., additional, Rawlings, J., additional, Richer, J., additional, Robertson, D., additional, Rosolowsky, E., additional, Rumble, D., additional, Sadavoy, S., additional, Thomas, H., additional, Tothill, N., additional, Viti, S., additional, White, G. J., additional, Wilson, C. D., additional, Wouterloot, J., additional, Yates, J., additional, and Zhu, M., additional

Published
2018
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207. The JCMT Gould Belt Survey: A First Look at SCUBA-2 Observations of the Lupus I Molecular Cloud

Author

Mowat, C., Hatchell, J., Rumble, D., Kirk, H., Buckle, J., Berry, D.S., Broekhoven-Fiene, H., Currie, M.J., Jenness, T., Johnstone, D., Mottram, J.C., Pattle, K., Tisi, S., Francesco, J. Di, Hogerheijde, M.R., Ward-Thompson, Derek, Bastien, P., Bresnahan, D., Butner, H., Chen, M., Chrysostomou, A., Coudé, S., Davis, C.J., Drabek-Maunder, E., Duarte-Cabral, A., Fich, M., Fiege, J., Friberg, P., Friesen, R., Fuller, G.A., Graves, S., Greaves, J., Holland, W., Joncas, G., Kirk, Jason Matthew, Knee, L.B.G., Mairs, S., Marsh, K., Matthews, B.C., Moriarty-Schieven, G., Rawlings, J., Retter, B., Richer, J., Robertson, D., Rosolowsky, E., Sadavoy, S., Thomas, H., Tothill, N., Viti, S., White, G.J., Wouterloot, J., Yates, J., Zhu, M., Mowat, C., Hatchell, J., Rumble, D., Kirk, H., Buckle, J., Berry, D.S., Broekhoven-Fiene, H., Currie, M.J., Jenness, T., Johnstone, D., Mottram, J.C., Pattle, K., Tisi, S., Francesco, J. Di, Hogerheijde, M.R., Ward-Thompson, Derek, Bastien, P., Bresnahan, D., Butner, H., Chen, M., Chrysostomou, A., Coudé, S., Davis, C.J., Drabek-Maunder, E., Duarte-Cabral, A., Fich, M., Fiege, J., Friberg, P., Friesen, R., Fuller, G.A., Graves, S., Greaves, J., Holland, W., Joncas, G., Kirk, Jason Matthew, Knee, L.B.G., Mairs, S., Marsh, K., Matthews, B.C., Moriarty-Schieven, G., Rawlings, J., Retter, B., Richer, J., Robertson, D., Rosolowsky, E., Sadavoy, S., Thomas, H., Tothill, N., Viti, S., White, G.J., Wouterloot, J., Yates, J., and Zhu, M.

Abstract

This paper presents observations of the Lupus I molecular cloud at 450 and 850 μm with Submillimetre Common User Bolometer Array (SCUBA-2) as part of the James Clerk Maxwell Telescope Gould Belt Survey (JCMT GBS). Nine compact sources, assumed to be the discs of young stellar objects (YSOs), 12 extended protostellar, pre-stellar and starless cores, and one isolated, low-luminosity protostar, are detected in the region. Spectral energy distributions, including submillimetre fluxes, are produced for 15 YSOs, and each is fitted with the models of Robitaille et al. The proportion of Class 0/I protostars is higher than that seen in other Gould Belt regions such as Ophiuchus and Serpens. Circumstellar disc masses are calculated for more evolved sources, while protostellar envelope masses are calculated for protostars. Up to four very low luminosity objects are found; a large fraction when compared to other Spitzer c2d regions. One YSO has a disc mass greater than the minimum mass solar nebula. 12 starless/protostellar cores are detected by SCUBA-2 and their masses are calculated. The stability of these cores is examined using both the thermal Jeans mass and a turbulent virial mass when possible. Two cores in Lupus I are super-Jeans and contain no known YSOs. One of these cores has a virial parameter of 1.1 ± 0.4, and could therefore be pre-stellar. The high ratio of Class 0/I to Class III YSOs (1:1), and the presence of a pre-stellar core candidate, provides support for the hypothesis that a shock recently triggered star formation in Lupus I.

Published
2017

208. The JCMT Gould Belt Survey: first results from the SCUBA-2 observations of the Ophiuchus molecular cloud and a virial analysis of its prestellar core population

Author

Pattle, K., Ward-Thompson, D., Kirk, J. M., White, G. J., Drabek-Maunder, E., Buckle, J., Beaulieu, S. F., Berry, D. S., Broekhoven-Fiene, H., Currie, M. J., Fich, M., Hatchell, J., Kirk, H., Jenness, T., Johnstone, D., Mottram, J. C., Nutter, D., Pineda, J. E., Quinn, C., Salji, C., Tisi, S., Walker-Smith, S., Francesco, J. Di, Hogerheijde, M. R., André, Ph, Bastien, P., Bresnahan, D., Butner, H., Chen, M., Chrysostomou, A., Coude, S., Davis, C. J., Duarte-Cabral, A., Fiege, J., Friberg, P., Friesen, R., Fuller, G. A., Graves, S., Greaves, J., Gregson, J., Griffin, M. J., Holland, W., Joncas, G., Knee, L. B. G., Könyves, V., Mairs, S., Marsh, K., Matthews, B. C., Moriarty-Schieven, G., Rawlings, J., Richer, J., Robertson, D., Rosolowsky, E., Rumble, D., Sadavoy, S., Spinoglio, L., Thomas, H., Tothill, N., Viti, S., Wouterloot, J., Yates, J., Zhu, M., Pattle, K., Ward-Thompson, D., Kirk, J. M., White, G. J., Drabek-Maunder, E., Buckle, J., Beaulieu, S. F., Berry, D. S., Broekhoven-Fiene, H., Currie, M. J., Fich, M., Hatchell, J., Kirk, H., Jenness, T., Johnstone, D., Mottram, J. C., Nutter, D., Pineda, J. E., Quinn, C., Salji, C., Tisi, S., Walker-Smith, S., Francesco, J. Di, Hogerheijde, M. R., André, Ph, Bastien, P., Bresnahan, D., Butner, H., Chen, M., Chrysostomou, A., Coude, S., Davis, C. J., Duarte-Cabral, A., Fiege, J., Friberg, P., Friesen, R., Fuller, G. A., Graves, S., Greaves, J., Gregson, J., Griffin, M. J., Holland, W., Joncas, G., Knee, L. B. G., Könyves, V., Mairs, S., Marsh, K., Matthews, B. C., Moriarty-Schieven, G., Rawlings, J., Richer, J., Robertson, D., Rosolowsky, E., Rumble, D., Sadavoy, S., Spinoglio, L., Thomas, H., Tothill, N., Viti, S., Wouterloot, J., Yates, J., and Zhu, M.

Abstract

In this paper, we present the first observations of the Ophiuchus molecular cloud performed as part of the James Clerk Maxwell Telescope (JCMT) Gould Belt Survey (GBS) with the SCUBA-2 instrument. We demonstrate methods for combining these data with previous HARP CO, Herschel, and IRAM N2H+ observations in order to accurately quantify the properties of the SCUBA-2 sources in Ophiuchus. We produce a catalogue of all of the sources found by SCUBA-2. We separate these into protostars and starless cores. We list all of the starless cores and perform a full virial analysis, including external pressure. This is the first time that external pressure has been included in this level of detail. We find that the majority of our cores are either bound or virialized. Gravitational energy and external pressure are on average of a similar order of magnitude, but with some variation from region to region. We find that cores in the Oph A region are gravitationally bound prestellar cores, while cores in the Oph C and E regions are pressure-confined. We determine that N2H+ is a good tracer of the bound material of prestellar cores, although we find some evidence for N2H+ freeze-out at the very highest core densities. We find that non-thermal linewidths decrease substantially between the gas traced by C18O and that traced by N2H+, indicating the dissipation of turbulence at higher densities. We find that the critical Bonnor-Ebert stability criterion is not a good indicator of the boundedness of our cores. We detect the pre-brown dwarf candidate Oph B-11 and find a flux density and mass consistent with previous work. We discuss regional variations in the nature of the cores and find further support for our previous hypothesis of a global evolutionary gradient across the cloud from south-west to north-east, indicating sequential star formation across the region

Published
2017

209. Multicriteria decision analysis for the evaluation of water quality improvement and ecosystem service provision

Author

McInnes, R, Smith, G.M, Greaves, J, Watson, D, Wood, N, and Everard, M

Abstract

Water and land management decisions require consideration of multiple factors. Multicriteria decision analysis (MCDA) provides a structured, auditable and transparent tool that helps inform and add rigour to multioption decisions. MCDA was used in a payment for ecosystem services (PES) project to evaluate options for delivering good ecological status in Tortworth Brook, Gloucestershire, UK. Following a process of stakeholder engagement, final options considered were: (1) doing nothing; (2) modifying existing sewage treatment works; (3) a single integrated constructed wetland (ICW) targeting multiple ecosystem service outcomes; and (4) catchment wide multiple ICWs. The analysis concluded that the ‘do nothing’ option and modifying the existing works are both likely to provide poor utility and value for money. Both ICW options offered the greatest utility in terms of optimising the benefits to all stakeholders.

Published
2016

210. Exocometary gas structure, origin and physical properties around β Pictoris through ALMA CO multitransition observations

Author

Matrà, L, Dent, WRF, Wyatt, MC, Kral, Q, Wilner, DJ, Panic, O, Hughes, AM, de Gregorio-Monsalvo, I, Hales, A, Augereau, J-C, Greaves, J, Roberge, A, Wyatt, Mark [0000-0001-9064-5598], and Apollo - University of Cambridge Repository

Subjects
molecular processes, comets: general, stars: individual: beta Pictoris, Astrophysics::Solar and Stellar Astrophysics, Astrophysics::Earth and Planetary Astrophysics, submillimetre: planetary systems, circumstellar matter, planetary systems, Astrophysics::Galaxy Astrophysics
Abstract

Recent ALMA observations unveiled the structure of CO gas in the 23 Myr-old $\beta$ Pictoris planetary system, a component that has been discovered in many similarly young debris disks. We here present ALMA CO J=2-1 observations, at an improved spectro-spatial resolution and sensitivity compared to previous CO J=3-2 observations. We find that 1) the CO clump is radially broad, favouring the resonant migration over the giant impact scenario for its dynamical origin, 2) the CO disk is vertically tilted compared to the main dust disk, at an angle consistent with the scattered light warp. We then use position-velocity diagrams to trace Keplerian radii in the orbital plane of the disk. Assuming a perfectly edge-on geometry, this shows a CO scale height increasing with radius as $R^{0.75}$, and an electron density (derived from CO line ratios through NLTE analysis) in agreement with thermodynamical models. Furthermore, we show how observations of optically thin line ratios can solve the primordial versus secondary origin dichotomy in gas-bearing debris disks. As shown for $\beta$ Pictoris, subthermal (NLTE) CO excitation is symptomatic of H$_2$ densities that are insufficient to shield CO from photodissociation over the system's lifetime. This means that replenishment from exocometary volatiles must be taking place, proving the secondary origin of the disk. In this scenario, assuming steady state production/destruction of CO gas, we derive the CO+CO$_2$ ice abundance by mass in $\beta$ Pic's exocomets to be at most $\sim$6%, consistent with comets in our own Solar System and in the coeval HD181327 system., LM acknowledges support by STFC and ESO through graduate studentships and, together with MCW and QK, by the European Union through ERC grant number 279973. Work of OP is funded by the Royal Society Dorothy Hodgkin Fellowship, and AMH gratefully acknowledges support from NSF grant AST-1412647., This is the final version of the article. It first appeared from Oxford University Press via https://doi.org/10.1093/mnras/stw2415

Published
2016
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213. Dirty Habits

Author

Greaves, J. P., Higginbottom, Wynefred, and Burton, John

Published
1958

218. Multiwavelength analysis for interferometric (sub-)mm observations of protoplanetary disks: Radial constraints on the dust properties of protoplanetary disks

Author

Tazzari, M., Testi, L., Ercolano, B., Natta, A., Isella, A., Chandler, C. J., Pérez, L. M., Andrews, S., Wilner, D. J., Ricci, L., Henning, T., Linz, H., Kwon, W., Corder, S. A., Dullemond, C. P., Carpenter, J. M., Sargent, A. I., Mundy, L., Storm, S., Calvet, N., Greaves, J. A., Lazio, J., and Deller, A. T.

Subjects
Astrophysics::Earth and Planetary Astrophysics, Astrophysics::Galaxy Astrophysics
Abstract

Context. The growth of dust grains from sub-μm to mm and cm sizes is the first step towards the formation of planetesimals. Theoretical models of grain growth predict that dust properties change as a function of disk radius, mass, age, and other physical conditions. High angular resolution observations at several (sub-)mm wavelengths constitute the ideal tool with which to directly probe the bulk of dust grains and to investigate the radial distribution of their properties. Aims. We lay down the methodology for a multiwavelength analysis of (sub-)mm and cm continuum interferometric observations to self-consistently constrain the disk structure and the radial variation of the dust properties. The computational architecture is massively parallel and highly modular. Methods. The analysis is based on the simultaneous fit in the uv-plane of observations at several wavelengths with a model for the disk thermal emission and for the dust opacity. The observed flux density at the different wavelengths is fitted by posing constraints on the disk structure and on the radial variation of the grain size distribution. Results. We apply the analysis to observations of three protoplanetary disks (AS 209, FT Tau, DR Tau) for which a combination of spatially resolved observations in the range ~0.88 mm to ~10 mm is available from SMA, CARMA, and VLA. In these disks we find evidence of a decrease in the maximum dust grain size, a_(max), with radius. We derive large a_(max) values up to 1 cm in the inner disk 15 AU ≤ R ≤ 30 AU and smaller grains with a_(max) ~ 1 mm in the outer disk (R ≳ 80 AU). Our analysis of the AS 209 protoplanetary disk confirms previous literature results showing amax decreasing with radius. Conclusions. Theoretical studies of planetary formation through grain growth are plagued by the lack of direct information on the radial distribution of the dust grain size. In this paper we develop a multiwavelength analysis that will allow this missing quantity to be constrained for statistically relevant samples of disks and to investigate possible correlations with disk or stellar parameters.

Published
2016

219. Exocometary gas structure, origin and physical properties around $��$ Pictoris through ALMA CO multi-transition observations

Author

Matr��, L., Dent, W. R. F., Wyatt, M. C., Kral, Q., Wilner, D. J., Pani��, O., Hughes, A. M., de Gregorio-Monsalvo, I., Hales, A., Augereau, J. -C., Greaves, J., and Roberge, A.

Subjects
Earth and Planetary Astrophysics (astro-ph.EP), Astrophysics::Solar and Stellar Astrophysics, FOS: Physical sciences, Astrophysics::Earth and Planetary Astrophysics, Astrophysics::Galaxy Astrophysics
Abstract

Recent ALMA observations unveiled the structure of CO gas in the 23 Myr-old $��$ Pictoris planetary system, a component that has been discovered in many similarly young debris disks. We here present ALMA CO J=2-1 observations, at an improved spectro-spatial resolution and sensitivity compared to previous CO J=3-2 observations. We find that 1) the CO clump is radially broad, favouring the resonant migration over the giant impact scenario for its dynamical origin, 2) the CO disk is vertically tilted compared to the main dust disk, at an angle consistent with the scattered light warp. We then use position-velocity diagrams to trace Keplerian radii in the orbital plane of the disk. Assuming a perfectly edge-on geometry, this shows a CO scale height increasing with radius as $R^{0.75}$, and an electron density (derived from CO line ratios through NLTE analysis) in agreement with thermodynamical models. Furthermore, we show how observations of optically thin line ratios can solve the primordial versus secondary origin dichotomy in gas-bearing debris disks. As shown for $��$ Pictoris, subthermal (NLTE) CO excitation is symptomatic of H$_2$ densities that are insufficient to shield CO from photodissociation over the system's lifetime. This means that replenishment from exocometary volatiles must be taking place, proving the secondary origin of the disk. In this scenario, assuming steady state production/destruction of CO gas, we derive the CO+CO$_2$ ice abundance by mass in $��$ Pic's exocomets to be at most $\sim$6%, consistent with comets in our own Solar System and in the coeval HD181327 system., 21 pages, 13 figures, Accepted for publication in MNRAS

Published
2016
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225. The JCMT Gould Belt Survey: A First Look at IC 5146

Author

Johnstone, D., primary, Ciccone, S., additional, Kirk, H., additional, Mairs, S., additional, Buckle, J., additional, Berry, D. S., additional, Broekhoven-Fiene, H., additional, Currie, M. J., additional, Hatchell, J., additional, Jenness, T., additional, Mottram, J. C., additional, Pattle, K., additional, Tisi, S., additional, Francesco, J. Di, additional, Hogerheijde, M. R., additional, Ward-Thompson, D., additional, Bastien, P., additional, Bresnahan, D., additional, Butner, H., additional, Chen, M., additional, Chrysostomou, A., additional, Coudé, S., additional, Davis, C. J., additional, Drabek-Maunder, E., additional, Duarte-Cabral, A., additional, Fich, M., additional, Fiege, J., additional, Friberg, P., additional, Friesen, R., additional, Fuller, G. A., additional, Graves, S., additional, Greaves, J., additional, Gregson, J., additional, Holland, W., additional, Joncas, G., additional, Kirk, J. M., additional, Knee, L. B. G., additional, Marsh, K., additional, Matthews, B. C., additional, Moriarty-Schieven, G., additional, Mowat, C., additional, Nutter, D., additional, Pineda, J. E., additional, Salji, C., additional, Rawlings, J., additional, Richer, J., additional, Robertson, D., additional, Rosolowsky, E., additional, Rumble, D., additional, Sadavoy, S., additional, Thomas, H., additional, Tothill, N., additional, Viti, S., additional, White, G. J., additional, Wouterloot, J., additional, Yates, J., additional, and Zhu, M., additional

Published
2017
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227. The JCMT Gould Belt Survey: A First Look at SCUBA-2 Observations of the Lupus I Molecular Cloud

Author

Mowat, C., primary, Hatchell, J., additional, Rumble, D., additional, Kirk, H., additional, Buckle, J., additional, Berry, D.S., additional, Broekhoven-Fiene, H., additional, Currie, M.J., additional, Jenness, T., additional, Johnstone, D., additional, Mottram, J.C., additional, Pattle, K., additional, Tisi, S., additional, Francesco, J. Di, additional, Hogerheijde, M.R., additional, Ward-Thompson, D., additional, Bastien, P., additional, Bresnahan, D., additional, Butner, H., additional, Chen, M., additional, Chrysostomou, A., additional, Coudé, S., additional, Davis, C.J., additional, Drabek-Maunder, E., additional, Duarte-Cabral, A., additional, Fich, M., additional, Fiege, J., additional, Friberg, P., additional, Friesen, R., additional, Fuller, G.A., additional, Graves, S., additional, Greaves, J., additional, Holland, W., additional, Joncas, G., additional, Kirk, J.M., additional, Knee, L.B.G., additional, Mairs, S., additional, Marsh, K., additional, Matthews, B.C., additional, Moriarty-Schieven, G., additional, Rawlings, J., additional, Retter, B., additional, Richer, J., additional, Robertson, D., additional, Rosolowsky, E., additional, Sadavoy, S., additional, Thomas, H., additional, Tothill, N., additional, Viti, S., additional, White, G.J., additional, Wouterloot, J., additional, Yates, J., additional, and Zhu, M., additional

Published
2017
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228. The JCMT Gould Belt Survey : low-mass proto-planetary discs from a SCUBA-2 census of NGC1333

Author

Dodds, P., Greaves, J., Scholz, A., Hatchell, J., Holland, W. S., Team, JCMT Gould Belt Survey, University of St Andrews. School of Physics and Astronomy, and Science & Technology Facilities Council

Subjects
FOS: Physical sciences, Protoplanetary discs, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Planet, pre-main sequence [Stars], Astrophysics::Solar and Stellar Astrophysics, QB Astronomy, James Clerk Maxwell Telescope, Astrophysics::Galaxy Astrophysics, formation [Stars], QC, QB, Earth and Planetary Astrophysics (astro-ph.EP), pre-main-sequence [Stars], Physics, Molecular cloud, Astronomy, Astronomy and Astrophysics, 3rd-DAS, Planetary system, Accretion (astrophysics), Stars, QC Physics, Space and Planetary Science, Astrophysics::Earth and Planetary Astrophysics, Formation and evolution of the Solar System, Low Mass, formation [Planets and satellites], Astrophysics - Earth and Planetary Astrophysics
Abstract

NGC1333 is a 1-2 Myr old cluster of stars in the Perseus molecular cloud. We used 850mu data from the Gould Belt Survey with SCUBA-2 on the JCMT to measure or place limits on disc masses for 82 Class II sources in this cluster. Eight disc-candidates were detected; one is estimated to have mass of about 9 Jupiter masses in dust plus gas, while the others host only 2-4 Jupiter masses of circumstellar material. None of these discs exceeds the threshold for the 'Minimum Mass Solar Nebula' (MMSN). This reinforces previous claims that only a small fraction of Class II sources at an age of 1-2 Myr has discs exceeding the MMSN threshold and thus can form a planetary system like our own. However, other regions with similarly low fractions of MMSN discs (IC348, UpSco, SigmaOri) are thought to be older than NGC1333. Compared with coeval regions, the exceptionally low fraction of massive discs in NGC1333 cannot easily be explained by the effects of UV radiation or stellar encounters. Our results indicate that additional environmental factors significantly affect disc evolution and the outcome of planet formation by core accretion., 7 pages, 3 figures, MNRAS in press

Published
2015

231. The JCMT Gould Belt Survey: a first look at Southern Orion A with SCUBA-2

Author

Mairs, S., Johnstone, D., Kirk, H., Buckle, J., Berry, D. S., Broekhoven-Fiene, H., Currie, M. J., Fich, M., Graves, S., Hatchell, J., Jenness, T., Mottram, J. C., Nutter, D., Pattle, K., Pineda, J. E., Salji, C., Di Francesco, J., Hogerheijde, M. R., Ward-Thompson, Derek, Bastien, P., Bresnahan, D., Butner, H., Chen, M., Chrysostomou, A., Coudé, S., Davis, C. J., Drabek-Maunder, E., Duarte-Cabral, A., Fiege, J., Friberg, P., Friesen, R., Fuller, G. A., Greaves, J., Gregson, J., Holland, W., Joncas, G., Kirk, Jason Matthew, Knee, L. B. G., Marsh, K., Matthews, B. C., Moriarty-Schieven, G., Mowat, C., Rawlings, J., Richer, J., Robertson, D., Rosolowsky, E., Rumble, D., Sadavoy, S., Thomas, H., Tothill, N., Viti, S., White, G. J., Wouterloot, J., Yates, J., Zhu, M., Mairs, S., Johnstone, D., Kirk, H., Buckle, J., Berry, D. S., Broekhoven-Fiene, H., Currie, M. J., Fich, M., Graves, S., Hatchell, J., Jenness, T., Mottram, J. C., Nutter, D., Pattle, K., Pineda, J. E., Salji, C., Di Francesco, J., Hogerheijde, M. R., Ward-Thompson, Derek, Bastien, P., Bresnahan, D., Butner, H., Chen, M., Chrysostomou, A., Coudé, S., Davis, C. J., Drabek-Maunder, E., Duarte-Cabral, A., Fiege, J., Friberg, P., Friesen, R., Fuller, G. A., Greaves, J., Gregson, J., Holland, W., Joncas, G., Kirk, Jason Matthew, Knee, L. B. G., Marsh, K., Matthews, B. C., Moriarty-Schieven, G., Mowat, C., Rawlings, J., Richer, J., Robertson, D., Rosolowsky, E., Rumble, D., Sadavoy, S., Thomas, H., Tothill, N., Viti, S., White, G. J., Wouterloot, J., Yates, J., and Zhu, M.

Abstract

We present the JCMT Gould Belt Survey’s first look results of the southern extent of the Orion A Molecular Cloud (δ ≤ −5:31:27.5). Employing a two-step structure identification process, we construct individual catalogues for large-scale regions of significant emission labelled as islands and smaller-scale subregions called fragments using the 850 µm contin- uum maps obtained using SCUBA-2. We calculate object masses, sizes, column densities, and concentrations. We discuss fragmentation in terms of a Jeans instability analysis and highlight interesting structures as candidates for follow-up studies. Furthermore, we associate the detected emission with young stellar objects (YSOs) identified by Spitzer and Herschel. We find that although the population of active star-forming regions contains a wide variety of sizes and morphologies, there is a strong positive correlation between the concentration of an emission region and its calculated Jeans instability. There are, however, a number of highly unstable subregions in dense areas of the map that show no evidence of star formation. We find that only ∼72 per cent of the YSOs defined as Class 0+I and flat-spectrum protostars coincide with dense 850 µm emission structures (column densities >3.7 × 1021 cm−2). The remaining 28 per cent of these objects, which are expected to be embedded in dust and gas, may be misclassified. Finally, we suggest that there is an evolution in the velocity dispersion of YSOs such that sources which are more evolved are associated with higher velocities.

Published
2016

232. The JCMT Gould Belt Survey: a first look at dense cores in Orion B

Author

Kirk, H., Francesco, J. Di, Johnstone, D., Duarte-Cabral, A., Sadavoy, S., Hatchell, J., Mottram, J. C., Buckle, J., Berry, D. S., Broekhoven-Fiene, H., Currie, M. J., Fich, M., Jenness, T., Nutter, D., Pattle, K., Pineda, J. E., Quinn, C., Salji, C., Tisi, S., Hogerheijde, M. R., Ward-Thompson, Derek, Bastien, P., Bresnahan, D., Butner, H., Chen, M., Chrysostomou, A., Coude, S., Davis, C. J., Drabek-Maunder, E., Fiege, J., Friberg, P., Friesen, R., Fuller, G. A., Graves, S., Greaves, J., Gregson, J., Holland, W., Joncas, G., Kirk, Jason Matthew, Knee, L. B. G., Mairs, S., Marsh, K., Matthews, B. C., Moriarty-Schieven, G., Mowat, C., Rawlings, J., Richer, J., Robertson, D., Rosolowsky, E., Rumble, D., Thomas, H., Tothill, N., Viti, S., White, G. J., Wouterloot, J., Yates, J., Zhu, M., Kirk, H., Francesco, J. Di, Johnstone, D., Duarte-Cabral, A., Sadavoy, S., Hatchell, J., Mottram, J. C., Buckle, J., Berry, D. S., Broekhoven-Fiene, H., Currie, M. J., Fich, M., Jenness, T., Nutter, D., Pattle, K., Pineda, J. E., Quinn, C., Salji, C., Tisi, S., Hogerheijde, M. R., Ward-Thompson, Derek, Bastien, P., Bresnahan, D., Butner, H., Chen, M., Chrysostomou, A., Coude, S., Davis, C. J., Drabek-Maunder, E., Fiege, J., Friberg, P., Friesen, R., Fuller, G. A., Graves, S., Greaves, J., Gregson, J., Holland, W., Joncas, G., Kirk, Jason Matthew, Knee, L. B. G., Mairs, S., Marsh, K., Matthews, B. C., Moriarty-Schieven, G., Mowat, C., Rawlings, J., Richer, J., Robertson, D., Rosolowsky, E., Rumble, D., Thomas, H., Tothill, N., Viti, S., White, G. J., Wouterloot, J., Yates, J., and Zhu, M.

Abstract

We present a first look at the SCUBA-2 observations of three sub-regions of the Orion B molecular cloud: LDN 1622, NGC 2023/2024, and NGC 2068/2071, from the JCMT Gould Belt Legacy Survey. We identify 29, 564, and 322 dense cores in L1622, NGC 2023/2024, and NGC 2068/2071 respectively, using the SCUBA-2 850 μm map, and present their basic properties, including their peak fluxes, total fluxes, and sizes, and an estimate of the corresponding 450 μm peak fluxes and total fluxes, using the FellWalker source extraction algorithm. Assuming a constant temperature of 20 K, the starless dense cores have a mass function similar to that found in previous dense core analyses, with a Salpeter-like slope at the high-mass end. The majority of cores appear stable to gravitational collapse when considering only thermal pressure; indeed, most of the cores which have masses above the thermal Jeans mass are already associated with at least one protostar. At higher cloud column densities, above 1–2 × 1023 cm−2, most of the mass is found within dense cores, while at lower cloud column densities, below 1 × 1023 cm−2, this fraction drops to 10% or lower. Overall, the fraction of dense cores associated with a protostar is quite small (<8%), but becomes larger for the densest and most centrally concentrated cores. NGC 2023/2024 and NGC 2068/2071 appear to be on the path to forming a significant number of stars in the future, while L1622 has little additional mass in dense cores to form many new stars.

Published
2016

233. Herschel detects oxygen in the beta Pictoris debris disk

Author

Brandeker, Alexis, Cataldi, Gianni, Olofsson, Göran, Vandenbussche, B., Acke, B., Barlow, M. J., Blommaert, J. A. D. L., Cohen, M., Dent, W. R. F., Dominik, C., Di Francesco, J., Fridlund, M., Gear, W. K., Glauser, A. M., Greaves, J. S., Harvey, P. M., Heras, A. M., Hogerheijde, M. R., Holland, W. S., Huygen, R., Ivison, R. J., Leeks, S. J., Lim, T. L., Liseau, R., Matthews, B. C., Pantin, E., Pilbratt, G. L., Royer, P., Sibthorpe, B., Waelkens, C., Walker, H. J., Brandeker, Alexis, Cataldi, Gianni, Olofsson, Göran, Vandenbussche, B., Acke, B., Barlow, M. J., Blommaert, J. A. D. L., Cohen, M., Dent, W. R. F., Dominik, C., Di Francesco, J., Fridlund, M., Gear, W. K., Glauser, A. M., Greaves, J. S., Harvey, P. M., Heras, A. M., Hogerheijde, M. R., Holland, W. S., Huygen, R., Ivison, R. J., Leeks, S. J., Lim, T. L., Liseau, R., Matthews, B. C., Pantin, E., Pilbratt, G. L., Royer, P., Sibthorpe, B., Waelkens, C., and Walker, H. J.

Abstract

The young star beta Pictoris is well known for its dusty debris disk produced through collisional grinding of planetesimals, kilometre-sized bodies in orbit around the star. In addition to dust, small amounts of gas are also known to orbit the star; this gas is likely the result of vaporisation of violently colliding dust grains. The disk is seen edge on and from previous absorption spectroscopy we know that the gas is very rich in carbon relative to other elements. The oxygen content has been more difficult to assess, however, with early estimates finding very little oxygen in the gas at a C/O ratio that is 20x higher than the cosmic value. A C/O ratio that high is difficult to explain and would have far-reaching consequences for planet formation. Here we report on observations by the far-infrared space telescope Herschel, using PACS, of emission lines from ionised carbon and neutral oxygen. The detected emission from C+ is consistent with that previously reported observed by the HIFI instrument on Herschel, while the emission from O is hard to explain without assuming a higher density region in the disk, perhaps in the shape of a clump or a dense torus required to sufficiently excite the O atoms. A possible scenario is that the C/O gas is produced by the same process responsible for the CO clump recently observed by the Atacama Large Millimeter/submillimeter Array in the disk and that the redistribution of the gas takes longer than previously assumed. A more detailed estimate of the C/O ratio and the mass of O will have to await better constraints on the C/O gas spatial distribution.

Published
2016
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234. The JCMT Gould Belt Survey: first results from SCUBA-2 observations of the Cepheus Flare region

Author

Pattle, K., Ward-Thompson, Derek, Kirk, Jason Matthew, Di Francesco, J., Kirk, H., Mottram, J. C., Keown, J., Buckle, J., Beaulieu, S. F., Berry, D. S., Broekhoven-Fiene, H., Currie, M. J., Fich, M., Hatchell, J., Jenness, T., Johnstone, D., Nutter, D., Pineda, J. E., Quinn, C., Salji, C., Tisi, S., Walker-Smith, S., Hogerheijde, M. R., Bastien, P., Bresnahan, D., Butner, H., Chen, M., Chrysostomou, A., Coudé, S., Davis, C. J., Drabek-Maunder, E., Duarte-Cabral, A., Fiege, J., Friberg, P., Friesen, R., Fuller, G. A., Graves, S., Greaves, J., Gregson, J., Holland, W., Joncas, G., Knee, L. B. G., Mairs, S., Marsh, K., Matthews, B. C., Moriarty-Schieven, G., Mowat, C., Rawlings, J., Richer, J., Robertson, D., Rosolowsky, E., Rumble, D., Sadavoy, S., Thomas, H., Tothill, N., Viti, S., White, G. J., Wouterloot, J., Yates, J., Zhu, M., Pattle, K., Ward-Thompson, Derek, Kirk, Jason Matthew, Di Francesco, J., Kirk, H., Mottram, J. C., Keown, J., Buckle, J., Beaulieu, S. F., Berry, D. S., Broekhoven-Fiene, H., Currie, M. J., Fich, M., Hatchell, J., Jenness, T., Johnstone, D., Nutter, D., Pineda, J. E., Quinn, C., Salji, C., Tisi, S., Walker-Smith, S., Hogerheijde, M. R., Bastien, P., Bresnahan, D., Butner, H., Chen, M., Chrysostomou, A., Coudé, S., Davis, C. J., Drabek-Maunder, E., Duarte-Cabral, A., Fiege, J., Friberg, P., Friesen, R., Fuller, G. A., Graves, S., Greaves, J., Gregson, J., Holland, W., Joncas, G., Knee, L. B. G., Mairs, S., Marsh, K., Matthews, B. C., Moriarty-Schieven, G., Mowat, C., Rawlings, J., Richer, J., Robertson, D., Rosolowsky, E., Rumble, D., Sadavoy, S., Thomas, H., Tothill, N., Viti, S., White, G. J., Wouterloot, J., Yates, J., and Zhu, M.

Abstract

We present observations of the Cepheus Flare obtained as part of the James Clerk Maxwell Telescope (JCMT) Gould Belt Legacy Survey (GBLS) with the SCUBA-2 instrument. We produce a catalogue of sources found by SCUBA-2, and separate these into starless cores and protostars. We determine masses and densities for each of our sources, using source temperatures determined by the Herschel Gould Belt Survey. We compare the properties of starless cores in four different molecular clouds: L1147/58, L1172/74, L1251 and L1228. We find that the core mass functions for each region typically show shallower-than-Salpeter behaviour. We find that L1147/58 and L1228 have a high ratio of starless cores to Class II protostars, while L1251 and L1174 have a low ratio, consistent with the latter regions being more active sites of current star formation, while the former are forming stars less actively. We determine that, if modelled as thermally-supported Bonnor-Ebert spheres, most of our cores have stable configurations accessible to them. We estimate the external pressures on our cores using archival 13CO velocity dispersion measurements and find that our cores are typically pressure-confined, rather than gravitationally bound. We perform a virial analysis on our cores, and find that they typically cannot be supported against collapse by internal thermal energy alone, due primarily to the measured external pressures. This suggests that the dominant mode of internal support in starless cores in the Cepheus Flare is either non-thermal motions or internal magnetic fields.

Published
2016

235. The Dust and Gas Content of a Disk around the Young Star HR 4796A

Author

Greaves, J. S., Mannings, V., and Holland, W. S.

Subjects
Astrophysics -- Research, Planets -- Analysis, Cosmic dust -- Analysis, Carbon monoxide -- Analysis, Stars, Astronomy, Earth sciences
Abstract

We have used the James Clerk Maxwell Telescope in Hawaii to search at submillimeter wavelengths for continuum emission from dust, and spectral line emission from carbon monoxide (CO) gas, in the neighborhood of HR 4796A. This Young star has a dusty disk with a central cavity, where planets may have formed. We detect the dust component at a wavelength of 850 [micro]m, and the inferred mass of solid material is [is greater than or equal to] 0.25 [M.sub.[direct sum]]. An upper limit for the CO J = 3-2 rotational line implies less than 1-7 [M.sub.[direct sum]] ([is less than or equal to] 0.003-0.02 Jupiter masses) of molecular [H.sub.2] gas in the system. Thus, it is no longer possible to form new Jupiter-like gaseous giant planets around HR 4796A. If planet formation explains the observed dust cavity and lack of gas, then it must have occurred before the current stellar age of ~10 Myr. A search was also made for CO J = 3-2 emission around four other stars with dust excesses revealed by infrared measurements with the Infrared Astronomical Satellite (IRAS). Two were detected, both of them young sources with optical emission lines indicative of ongoing accretion of disk material onto the star. The gas mass lower limits are approximately 30 and 200 Earth masses, at least an order of magnitude higher than that for HR 4796A, illustrating the diversity of disk properties at ages of up to 10 Myr. Key Words: planets; formation; extraterrestrial planets.

Published
2000

236. Extreme Conditions in a Close Analog to the Young Solar System: Herschel Observation is an element of Eridani

Author

Greaves, J. S., Sibthorpe, B., Acke, B., Pantin, E. E., Vandenbussche, B., Olofsson, G., Dominik, C., Barlow, M. J., Bendo, G. J., Blommaert, J. A. D. L., Brandeker, A., de Vries, B. L., Dent, W. R. F., Di Francesco, J., Fridlund, M., Gear, W. K., Harvey, P. M., Hogerheijde, M. R., Holland, W. S., Ivison, R. J., Liseau, R., Matthews, B. C., Pilbratt, G. L., Walker, H. J., Waelkens, C., Physics, Astrophysics, and Astronomy and Astrophysics Research Group

Subjects
planet-disk interactions, stars: individual (is an element of Eridani), circumstellar matter
Abstract

Far-infrared Herschel images of the epsilon Eridani system, seen at a fifth of the Sun's present age, resolve two belts of debris emission. Fits to the 160 ?m PACS image yield radial spans for these belts of 12-16 and 54-68 AU. The south end of the outer belt is ?10% brighter than the north end in the PACS+SPIRE images at 160, 250, and 350 ?m, indicating a pericenter glow attributable to a planet "c." From this asymmetry and an upper bound on the offset of the belt center, this second planet should be mildly eccentric (ec ? 0.03-0.3). Compared to the asteroid and Kuiper Belts of the young Sun, the epsilon Eri belts are intermediate in brightness and more similar to each other, with up to 20 km sized collisional fragments in the inner belt totaling ?5% of an Earth mass. This reservoir may feed the hot dust close to the star and could send many impactors through the Habitable Zone, especially if it is being perturbed by the suspected planet epsilon Eri b, at semi-major axis ?3 AU.

Published
2014

237. Spatially Resolved Imaging of the Two-component \u03b7 Crv Debris Disk with Herschel

Author

Duchxeane, G., Arriaga, P., Wyatt, M., Kennedy, G., Sibthorpe, B., Lisse, C., Holland, W., Wisniewski, J., Clampin, M., Kalas, P., Pinte, C., Wilner, D., Booth, M., Horner, J., Matthews, B., Greaves, J., Duchxeane, Arriaga, Wyatt, Kennedy, Sibthorpe, Lisse, Holland, Wisniewski, Clampin, Kalas, Pinte, Wilner, Booth, Horner, Matthews, and Greaves

Published
2014

238. Molecular Gas Clumps from the Destruction of Icy Bodies in the \u03b2 Pictoris Debris Disk

Author

Dent, W. R. F., Wyatt, M. C., Roberge, A., Augereau, J.-C., Casassus, S., Corder, S., Greaves, J. S., de Gregorio-Monsalvo, I., Hales, A., Jackson, A. P., Hughes, A. Meredith, Lagrange, A.-M., Matthews, B., Wilner, D., Dent, W. R. F., Wyatt, M. C., Roberge, Augereau, J.-C., Casassus, Corder, Greaves, J. S., de Gregorio-Monsalvo, Hales, Jackson, A. P., Hughes, A. Meredith, Lagrange, A.-M., Matthews, and Wilner

Published
2014

239. The Eagle Nebula's fingers: pointers to the earliest stages of star formation?

Author

White, G. J., Nelson, R. P., Holland, W. S., Robson, E. I., Greaves, J. S., McCaughrean, M. J., Pilbratt, G. L., Balser, D. S., McCutcheon, W. H., Matthews, H. E., Fridlund, C. V. M., Tothill, N. F. H., Huldtgren, M., Deane, J. R., Oka, Tomoharu, Sakamoto, Seiichi, and Hasegawa, Tetsuo

Abstract

著者人数: 17名, Accepted: 1998-10-16, 資料番号: SA1003569000

Published
1999

241. The JCMT Gould Belt Survey: first results from SCUBA-2 observations of the Cepheus Flare region

Author

Pattle, K., primary, Ward-Thompson, D., additional, Kirk, J. M., additional, Di Francesco, J., additional, Kirk, H., additional, Mottram, J. C., additional, Keown, J., additional, Buckle, J., additional, Beaulieu, S. F., additional, Berry, D. S., additional, Broekhoven-Fiene, H., additional, Currie, M. J., additional, Fich, M., additional, Hatchell, J., additional, Jenness, T., additional, Johnstone, D., additional, Nutter, D., additional, Pineda, J. E., additional, Quinn, C., additional, Salji, C., additional, Tisi, S., additional, Walker-Smith, S., additional, Hogerheijde, M. R., additional, Bastien, P., additional, Bresnahan, D., additional, Butner, H., additional, Chen, M., additional, Chrysostomou, A., additional, Coudé, S., additional, Davis, C. J., additional, Drabek-Maunder, E., additional, Duarte-Cabral, A., additional, Fiege, J., additional, Friberg, P., additional, Friesen, R., additional, Fuller, G. A., additional, Graves, S., additional, Greaves, J., additional, Gregson, J., additional, Holland, W., additional, Joncas, G., additional, Knee, L. B. G., additional, Mairs, S., additional, Marsh, K., additional, Matthews, B. C., additional, Moriarty-Schieven, G., additional, Mowat, C., additional, Rawlings, J., additional, Richer, J., additional, Robertson, D., additional, Rosolowsky, E., additional, Rumble, D., additional, Sadavoy, S., additional, Thomas, H., additional, Tothill, N., additional, Viti, S., additional, White, G. J., additional, Wouterloot, J., additional, Yates, J., additional, and Zhu, M., additional

Published
2016
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243. THE JCMT GOULD BELT SURVEY: EVIDENCE FOR DUST GRAIN EVOLUTION IN PERSEUS STAR-FORMING CLUMPS

Author

Chen, Michael Chun-Yuan, primary, Francesco, J. Di, additional, Johnstone, D., additional, Sadavoy, S., additional, Hatchell, J., additional, Mottram, J. C., additional, Kirk, H., additional, Buckle, J., additional, Berry, D. S., additional, Broekhoven-Fiene, H., additional, Currie, M. J., additional, Fich, M., additional, Jenness, T., additional, Nutter, D., additional, Pattle, K., additional, Pineda, J. E., additional, Quinn, C., additional, Salji, C., additional, Tisi, S., additional, Hogerheijde, M. R., additional, Ward-Thompson, D., additional, Bastien, P., additional, Bresnahan, D., additional, Butner, H., additional, Chrysostomou, A., additional, Coude, S., additional, Davis, C. J., additional, Drabek-Maunder, E., additional, Duarte-Cabral, A., additional, Fiege, J., additional, Friberg, P., additional, Friesen, R., additional, Fuller, G. A., additional, Graves, S., additional, Greaves, J., additional, Gregson, J., additional, Holland, W., additional, Joncas, G., additional, Kirk, J. M., additional, Knee, L. B. G., additional, Mairs, S., additional, Marsh, K., additional, Matthews, B. C., additional, Moriarty-Schieven, G., additional, Mowat, C., additional, Pezzuto, S., additional, Rawlings, J., additional, Richer, J., additional, Robertson, D., additional, Rosolowsky, E., additional, Rumble, D., additional, Schneider-Bontemps, N., additional, Thomas, H., additional, Tothill, N., additional, Viti, S., additional, White, G. J., additional, Wouterloot, J., additional, Yates, J., additional, and Zhu, M., additional

Published
2016
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245. The JCMT Gould Belt Survey: a first look at Southern Orion A with SCUBA-2

Author

Mairs, S., primary, Johnstone, D., additional, Kirk, H., additional, Buckle, J., additional, Berry, D. S., additional, Broekhoven-Fiene, H., additional, Currie, M. J., additional, Fich, M., additional, Graves, S., additional, Hatchell, J., additional, Jenness, T., additional, Mottram, J. C., additional, Nutter, D., additional, Pattle, K., additional, Pineda, J. E., additional, Salji, C., additional, Di Francesco, J., additional, Hogerheijde, M. R., additional, Ward-Thompson, D., additional, Bastien, P., additional, Bresnahan, D., additional, Butner, H., additional, Chen, M., additional, Chrysostomou, A., additional, Coudé, S., additional, Davis, C. J., additional, Drabek-Maunder, E., additional, Duarte-Cabral, A., additional, Fiege, J., additional, Friberg, P., additional, Friesen, R., additional, Fuller, G. A., additional, Greaves, J., additional, Gregson, J., additional, Holland, W., additional, Joncas, G., additional, Kirk, J. M., additional, Knee, L. B. G., additional, Marsh, K., additional, Matthews, B. C., additional, Moriarty-Schieven, G., additional, Mowat, C., additional, Rawlings, J., additional, Richer, J., additional, Robertson, D., additional, Rosolowsky, E., additional, Rumble, D., additional, Sadavoy, S., additional, Thomas, H., additional, Tothill, N., additional, Viti, S., additional, White, G. J., additional, Wouterloot, J., additional, Yates, J., additional, and Zhu, M., additional

Published
2016
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246. Early science with the Large Millimetre Telescope: Deep LMT/AzTEC millimetre observations of ϵ Eridani and its surroundings

Author

Chavez-Dagostino, M., primary, Bertone, E., additional, Cruz-Saenz de Miera, F., additional, Marshall, J. P., additional, Wilson, G. W., additional, Sánchez-Argüelles, D., additional, Hughes, D. H., additional, Kennedy, G., additional, Vega, O., additional, De la Luz, V., additional, Dent, W. R. F., additional, Eiroa, C., additional, Gómez-Ruiz, A. I., additional, Greaves, J. S., additional, Lizano, S., additional, López-Valdivia, R., additional, Mamajek, E., additional, Montaña, A., additional, Olmedo, M., additional, Rodríguez-Montoya, I., additional, Schloerb, F. P., additional, Yun, Min S., additional, Zavala, J. A., additional, and Zeballos, M., additional

Published
2016
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247. Herscheldetects oxygen in theβPictoris debris disk

Author

Brandeker, A., primary, Cataldi, G., additional, Olofsson, G., additional, Vandenbussche, B., additional, Acke, B., additional, Barlow, M. J., additional, Blommaert, J. A. D. L., additional, Cohen, M., additional, Dent, W. R. F., additional, Dominik, C., additional, Di Francesco, J., additional, Fridlund, M., additional, Gear, W. K., additional, Glauser, A. M., additional, Greaves, J. S., additional, Harvey, P. M., additional, Heras, A. M., additional, Hogerheijde, M. R., additional, Holland, W. S., additional, Huygen, R., additional, Ivison, R. J., additional, Leeks, S. J., additional, Lim, T. L., additional, Liseau, R., additional, Matthews, B. C., additional, Pantin, E., additional, Pilbratt, G. L., additional, Royer, P., additional, Sibthorpe, B., additional, Waelkens, C., additional, and Walker, H. J., additional

Published
2016
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248. The JCMT Gould Belt Survey: evidence for radiative heating and contamination in the W40 complex

Author

Rumble, D., primary, Hatchell, J., additional, Pattle, K., additional, Kirk, H., additional, Wilson, T., additional, Buckle, J., additional, Berry, D.S., additional, Broekhoven-Fiene, H., additional, Currie, M.J., additional, Fich, M., additional, Jenness, T., additional, Johnstone, D., additional, Mottram, J. C., additional, Nutter, D., additional, Pineda, J.E., additional, Quinn, C., additional, Salji, C., additional, Tisi, S., additional, Walker-Smith, S., additional, Francesco, J. Di, additional, Hogerheijde, M.R., additional, Ward-Thompson, D., additional, Bastien, P., additional, Bresnahan, D., additional, Butner, H., additional, Chen, M., additional, Chrysostomou, A., additional, Coude, S., additional, Davis, C.J., additional, Drabek-Maunder, E., additional, Duarte-Cabral, A., additional, Fiege, J., additional, Friberg, P., additional, Friesen, R., additional, Fuller, G.A., additional, Graves, S., additional, Greaves, J., additional, Gregson, J., additional, Holland, W., additional, Joncas, G., additional, Kirk, J. M., additional, Knee, L. B. G., additional, Mairs, S., additional, Marsh, K., additional, Matthews, B. C., additional, Moriarty-Schieven, G., additional, Mowat, C., additional, Rawlings, J., additional, Richer, J., additional, Robertson, D., additional, Rosolowsky, E., additional, Sadavoy, S., additional, Thomas, H., additional, Tothill, N., additional, Viti, S., additional, White, G. J., additional, Wouterloot, J., additional, Yates, J., additional, and Zhu, M., additional

Published
2016
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249. Dust properties across the CO snowline in the HD 163296 disk from ALMA and VLA observations

Author

Guidi, G., primary, Tazzari, M., additional, Testi, L., additional, de Gregorio-Monsalvo, I., additional, Chandler, C. J., additional, Pérez, L., additional, Isella, A., additional, Natta, A., additional, Ortolani, S., additional, Henning, Th., additional, Corder, S., additional, Linz, H., additional, Andrews, S., additional, Wilner, D., additional, Ricci, L., additional, Carpenter, J., additional, Sargent, A., additional, Mundy, L., additional, Storm, S., additional, Calvet, N., additional, Dullemond, C., additional, Greaves, J., additional, Lazio, J., additional, Deller, A., additional, and Kwon, W., additional

Published
2016
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250. Multiwavelength analysis for interferometric (sub-)mm observations of protoplanetary disks

Author

Tazzari, M., primary, Testi, L., additional, Ercolano, B., additional, Natta, A., additional, Isella, A., additional, Chandler, C. J., additional, Pérez, L. M., additional, Andrews, S., additional, Wilner, D. J., additional, Ricci, L., additional, Henning, T., additional, Linz, H., additional, Kwon, W., additional, Corder, S. A., additional, Dullemond, C. P., additional, Carpenter, J. M., additional, Sargent, A. I., additional, Mundy, L., additional, Storm, S., additional, Calvet, N., additional, Greaves, J. A., additional, Lazio, J., additional, and Deller, A. T., additional

Published
2016
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