After a call for proposals in 2014, 6 programs are selected as legacy programs. The title, abstract and source of the proposals are shown below.
We propose to observe ~300 standard stars with IGRINS to provide high quality of stellar spectral library in H and K bands, which can be used to support various scientific programs. Targets will cover a wide range of grid in effective temperature and surface gravity as well as a wide range of metallicity. We pursue the high SNR of 250, which is especially required since the weakest lines in NIR can be used for oscillator strength determination as well as elemental abundance determinations.
coIs
target list (updated 2014-12-31)
We propose to study the magnetic fields of 49 Class I young stellar objects (YSOs) with K < 11 mag extracted from the Spitzer survey of all 36 nearby star forming regions by measuring Zeeman broadening of magnetically sensitive Ti I lines in unpolarized light. Measuring the magnetic field strengths of Class I YSOs together with the previously measured B-fields of Class II and III YSOs will provide us with answers to two important questions. When does the magnetic field of a YSO start to control the accretion process? How do the fields in YSOs evolve? IGRINS with R = 40000 will provide the unique chance to measure the magnetic fields of Class I YSOs which cannot be studied in the optical wavelength due to their faintness.
coIs
We propose the IGRINS observation of protoplanetary disks in Taurus-Auriga star-forming region. The main goal of this program is to archive high-resolution near-IR spectra of Class II/III young stellar objects in Taurus and to investigate mass accretion process through systematic study to understand star-disk mass accretion in the process of planet formation and their effects on disk evolution. Since protoplanetary disks in Taurus have been broadly observed with Spitzer and Herschel, the high-resolution IGRINS spectra at H and K bands in this program can give more complete information of gas and dust in disks when they are combined with mid-IR spectra and far-IR spectra taken by Spitzer and Herschel.
coIs
target list (updated 2014-09-19)
We propose to observe disks in wide ranges of age, luminosity, and mass (from Class I to wTTSs, and from lowmass TTSs to Herbig Ae/Be stars and massive YSOs) with IGRINS to study the evolution of physical and chemical conditions at the inner gaseous disks, where planets form. We will also observe FU Orionis objects to understand the effect of star formation process to the inner disks. Therefore, this program will provide a complete inventory of high resolution spectra of YSOs in various evolutionary stages and masses.
coIs
We propose an IGRINS legacy program to observe selected 25 Class I stars which show strong signals of outflows ([Fe II], H2) and accretion (BrĪ³) in star-forming regions. Mass accretion and mass loss rates will be compared for the first time to spectral types in a representative sample of Class I objects. In order to investigate the process from accretion to outflows and jets with these early evolutionary stage stars, we will compare line profiles and intensities of various emission lines in different velocity components that may have different launching origins. We will verify the evolutionary stage of the sources with the photospheric lines. Observational simultaneity of IGRINS with wide spectral coverage including whole H- and K-bands provides for us with the optimum opportunity for this project.
coIs
We propose a systematic survey of A0V stars distributed over the entire observable sky with IGRINS. The primary purpose of this proposal is 1) to characterize the behavior of telluric features, 2) to develop a descent method for telluric correction which can be used for IGRINS and other high resolution spectrograph and 3) to publicly provide a catalog of telluric standard stars with well determined intrinsic spectra so that observers can use these for their telluric correction.