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We have analyzed the HCO+ (1-0) data of the Class I-II protostar, HL Tau,obtained from the Atacama Large Millimeter/Submillimeter Array long baselinecampaign. We generated the HCO+ image cube at an angular resolution of ~0.07(~10 AU), and performed azimuthal averaging on the image cube to enhance thesignal-to-noise ratio and measure the radial profile of the HCO+ integratedintensity. Two gaps at radii of ~28 AU and ~69 AU and a central cavity areidentified in the radial intensity profile. The inner HCO+ gap is coincidentwith the millimeter continuum gap at a radius of 32 AU. The outer HCO+ gap islocated at the millimeter continuum bright ring at a radius of 69 AU andoverlaps with the two millimeter continuum gaps at radii of 64 AU and 74 AU. Onthe contrary, the presence of the central cavity is likely due to the highoptical depth of the 3 mm continuum emission and not the depletion of the HCO+gas. We derived the HCO+ column density profile from its intensity profile.From the column density profile, the full-width-half-maximum widths of theinner and outer HCO+ gaps are both estimated to be ~14 AU, and their depths areestimated to be ~2.4 and ~5.0. These results are consistent with theexpectation from the gaps opened by forming (sub-)Jovian mass planets, whileplacing tight constraints on the theoretical models solely incorporating thevariation of dust properties and grain sizes.

Gas Gaps in the Protoplanetary Disk around the Young Protostar HL Tau