Suchitra Narayanan
A5047644005- Astrophysics and Star Formation Studies
- Molecular Spectroscopy and Structure
- Astro and Planetary Science
- Stellar, planetary, and galactic studies
- Atmospheric Ozone and Climate
- Phase Equilibria and Thermodynamics
- Planetary Science and Exploration
- Astronomical Observations and Instrumentation
- Astronomy and Astrophysical Research
- Space Satellite Systems and Control
University of Hawaiʻi at Mānoa
2022-2023
We present an overview of the Large Program, ``Early Planet Formation in Embedded Disks (eDisk)'', conducted with Atacama Millimeter/submillimeter Array (ALMA). The ubiquitous detections substructures, particularly rings and gaps, protoplanetary disks around T Tauri stars raise possibility that at least some planet formation may have already started during embedded stages star formation. In order to address exactly how when is initiated, program focuses on searching for substructures 12...
Abstract We present observations of the Class 0 protostar IRAS 16544–1604 in CB 68 from “Early Planet Formation Embedded Disks (eDisk)” ALMA Large program. The target continuum and lines at 1.3 mm with an angular resolution ∼5 au. image reveals a dusty protostellar disk radius ∼30 au seen close to edge-on asymmetric structures along both major minor axes. While asymmetry axis can be interpreted as effect dust flaring, comes real nonaxisymmetric structure. C 18 O cubes clearly show gas that...
Studying the physical and chemical conditions of young embedded disks is crucial to constrain initial for planet formation. Here, we present Atacama Large Millimeter/submillimeter Array (ALMA) observations dust continuum at $\sim$0.06" (8 au) resolution molecular line emission $\sim$0.17" (24 toward Class 0 protostar L1527 IRS from Program eDisk (Early Planet Formation in Embedded Disks). The smooth without substructures, but asymmetric along both major minor axes disk as previously...
Constraining the physical and chemical structure of young embedded disks is crucial to understanding earliest stages planet formation. As part Early Planet Formation in Embedded Disks Atacama Large Millimeter/submillimeter Array Program, we present high spatial resolution ($\sim$0$.\!\!^{\prime\prime}$1 or $\sim$15 au) observations 1.3 mm continuum $^{13}$CO $J=$ 2-1, C$^{18}$O SO $J_N=$ $6_5$-$5_4$ molecular lines toward disk around Class I protostar L1489 IRS. The emission shows a...
Abstract We present Atacama Large Millimeter/submillimeter Array (ALMA) observations of the Class I source Oph IRS 63 in context Early Planet Formation Embedded Disks large program. Our ALMA show a myriad protostellar features, such as shell-like bipolar outflow (in 12 CO), an extended rotating envelope structure 13 streamer connecting to disk C 18 O), and several small-scale spiral structures seen toward edge dust continuum SO). By analyzing velocity pattern CO O, we measure mass M ⋆ = 0.5...
Abstract Precise estimates of protostellar masses are crucial to characterize the formation stars low down brown dwarfs (BDs; M * < 0.08 ☉ ). The most accurate estimation mass uses Keplerian rotation in circumstellar disk around protostar. To apply method a protostar at low-mass end, we have observed Class 0 IRAS 16253-2429 using Atacama Large Millimeter/submillimeter Array (ALMA) 1.3 mm continuum an angular resolution 0.″07 (10 au), and 12 CO, C 18 O, 13 CO ( J = 2–1), SO N 6 5 −5 4 )...
Abstract Protostellar disks are an ubiquitous part of the star formation process and future sites planet formation. As Early Planet Formation in Embedded Disks large program, we present high angular resolution dust continuum (∼40 mas) molecular line (∼150 observations Class 0 protostar IRAS 15398–3359. The is small, compact, centrally peaked, while more extended structures found outflow directions. We perform a 2D Gaussian fitting find deconvolved size 2 σ radius disk to be 4.5 × 2.8 au 3.8...
Studies of T Tauri disks inform planet formation theory; observations variability due to occultation by circumstellar dust are a useful probe unresolved, planet-forming inner disks, especially around faint M dwarf stars. We report 2M0632, an member the Carina young moving group that was observed TESS over two one-year intervals. The combined light curve contains >300 dimming events, each lasting few hours, and as deep 40% (0.55 magnitudes). These stochastic events correlated with distinct,...
Abstract We present the first results from Early Planet Formation in Embedded Disks Atacama Large Millimeter/submillimeter Array Program toward Oph IRS43, a binary system of solar mass protostars. The 1.3 mm dust continuum observations resolve compact disk, ∼6 au radius, around northern component and show that disk southern is even smaller, ≲3 au. CO, 13 C 18 O maps reveal large cavity low-mass envelope shows kinematic signatures rotation infall extending out to ∼2000 An expanding CO bubble...
Hundreds of exoplanets between 1-1.8 times the size Earth have been discovered on close in orbits. However, these planets show such a diversity densities that some appear to be made entirely iron, while others host gaseous envelopes. To test this composition, we update masses 5 rocky (HD 93963 A b, Kepler-10 Kepler-100 Kepler-407 and TOI-1444 b) present confirmation new planet (TOI-1011) using 187 high precision RVs from Gemini/MAROON-X Keck/KPF. Our updated suggest compositions closer than...
Abstract We present Atacama Large Millimeter/submillimeter Array (ALMA) observations of the binary Class 0 protostellar system BHR 71 IRS1 and IRS2 as part Early Planet Formation in Embedded Disks (eDisk) ALMA Program. describe 12 CO ( J = 2–1), 13 C 18 O H 2 3 2,1 –2 2,0 ), SiO 5–4) molecular lines along with 1.3 mm continuum at high spatial resolution (∼0.″08 or ∼5 au). Dust emission is detected toward IRS2, a central compact component extended emission. The components are smooth show no...
Constraining the physical and chemical structure of young embedded disks is crucial to understanding earliest stages planet formation. As part Early Planet Formation in Embedded Disks Atacama Large Millimeter/submillimeter Array Program, we present high spatial resolution ($\sim$0$.\!\!^{\prime\prime}$1 or $\sim$15 au) observations 1.3 mm continuum $^{13}$CO $J=$ 2-1, C$^{18}$O SO $J_N=$ $6_5$-$5_4$ molecular lines toward disk around Class I protostar L1489 IRS. The emission shows a...
Studying the physical and chemical conditions of young embedded disks is crucial to constrain initial for planet formation. Here, we present Atacama Large Millimeter/submillimeter Array (ALMA) observations dust continuum at $\sim$0.06" (8 au) resolution molecular line emission $\sim$0.17" (24 toward Class 0 protostar L1527 IRS from Program eDisk (Early Planet Formation in Embedded Disks). The smooth without substructures, but asymmetric along both major minor axes disk as previously...
We present an overview of the Large Program, ``Early Planet Formation in Embedded Disks (eDisk)'', conducted with Atacama Millimeter/submillimeter Array (ALMA). The ubiquitous detections substructures, particularly rings and gaps, protoplanetary disks around T Tauri stars raise possibility that at least some planet formation may have already started during embedded stages star formation. In order to address exactly how when is initiated, program focuses on searching for substructures 12...
We present observations of the Class 0 protostar IRAS 16544-1604 in CB 68 from ''Early Planet Formation Embedded Disks (eDisk)'' ALMA Large program. The target continuum and lines at 1.3-mm with an angular resolution $\sim$5 au. image reveals a dusty protostellar disk radius $\sim$30 au seen close to edge-on, asymmetric structures both along major minor axes. While asymmetry axis can be interpreted as effect dust flaring, comes real non-axisymmetric structure. C$^{18}$O cubes clearly show...
Precise estimates of protostellar masses are crucial to characterize the formation stars low down brown-dwarfs (BDs; M* < 0.08 Msun). The most accurate estimation mass uses Keplerian rotation in circumstellar disk around protostar. To apply method a protostar at low-mass end, we have observed Class 0 IRAS 16253-2429 using Atacama Large Millimeter/submillimeter Array (ALMA) 1.3 mm continuum an angular resolution 0.07" (10 au), and 12CO, C18O, 13CO (J=2-1), SO (J_N = 6_5-5_4) molecular...
Protostellar disks are a ubiquitous part of the star formation process and future sites planet formation. As Early Planet Formation in Embedded Disks (eDisk) large program, we present high-angular resolution dust continuum ($\sim40\,$mas) molecular line ($\sim150\,$mas) observations Class 0 protostar, IRAS 15398-3359. The is small, compact, centrally peaked, while more extended structures found outflow directions. We perform 2D Gaussian fitting to find deconvolved size $2\sigma$ radius disk...
We present ALMA observations of the Class I source Oph IRS63 in context Early Planet Formation Embedded Disks (eDisk) large program. Our show a myriad protostellar features, such as shell-like bipolar outflow (in $^{12}$CO), an extended rotating envelope structure $^{13}$CO), streamer connecting to disk C$^{18}$O), and several small-scale spiral structures seen towards edge dust continuum SO). By analyzing velocity pattern $^{13}$CO C$^{18}$O, we measure mass $\rm M_\star = 0.5 \pm 0.2...
We present the first results from Early Planet Formation in Embedded Disks (eDisk) ALMA Large Program toward Oph IRS43, a binary system of solar mass protostars. The 1.3 mm dust continuum observations resolve compact disk, ~6au radius, around northern component and show that disk southern is even smaller, <~3 au. CO, 13CO, C18O maps reveal large cavity low envelope shows kinematic signatures rotation infall extending out to ~ 2000au. An expanding CO bubble centered on extrapolated location...
With the proliferation of online Zoom meetings as a means doing science in 2020s, astronomers have made new and unexpected Target Opportunity (ToO) observations. Chief among these ToOs are observations exop(lan)ets, or "exopets." Building on work Mayorga et al. (2021) - whose characterized rotational variations "floofy" objects we model exopets using methods similar to those used for exoplanetary transits. We present data collected such exopet transits through citizen program month February...
Studies of T Tauri disks inform planet formation theory; observations variability due to occultation by circumstellar dust are a useful probe unresolved, planet-forming inner disks, especially around faint M dwarf stars. We report 2M0632, an member the Carina young moving group that was observed TESS over two one-year intervals. The combined light curve contains >300 dimming events, each lasting few hours, and as deep 40% (0.55 magnitudes). These stochastic events correlated with...